JPH0356904Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention aims at irradiating a laser beam onto an optical disk on which information signals such as music signals and video signals are recorded, and reading and reproducing the information signals using the reflected beams. The present invention relates to a disk mounting device provided for mounting and mounting a disk such as the above-mentioned optical disk in a proper centering state in a disk player such as an optical disk player.

<Prior Art> Conventionally, as a disk mounting device provided in an optical disk player or the like, the one shown in FIG. 5 is known. This disk mounting device has a spindle shaft 3 which is rotationally driven by a drive motor 2 attached to a chassis 1 of an optical disk player.
A disk receiving member 4 and a centering member 5 are attached to the disk. The disk receiving member 4 and the centering member 5 are both made of metal such as brass, and are inserted into the spindle shaft 3. The disk receiving member 4 has a flange portion 7 for receiving the optical disk 6 at its distal end, and a set screw 8 is screwed into a threaded hole formed through the base end in the radial direction. It is fixed to the spindle shaft 3 by tightening. The centering member 5 is engaged and held by a retaining ring 9 attached to the tip of the spindle shaft 3, and is elastically supported by a spring 10 disposed between the centering member 5 and the disk receiving member 4. There is. Note that the surface of this centering member 5 is chrome plated to provide high smoothness.

The disk mounting device configured in this way has the following features:
The optical disk 6 is placed on the flange portion 7 so that the centering member 5 is fitted into a fitting hole 6a provided at the center thereof.

Further, in an optical disc player equipped with such a disc mounting device, the optical disc 6 is attached to the pressing member 11 constituting the opening/closing lid, for example.
A holding member 12 for clamping and holding the disc on the disk mounting device is rotatably engaged and held via a thrust ball 13.

When the pressing member 11 is closed and locked, the optical disc 6 is moved to the holding member 1.
2 and a disk mounting device in a rotatable state, and is rotated by the drive of the drive motor 2.

The pressing force of the pressing member 11 is absorbed by a thrust bearing 14 that supports the spindle shaft 3 provided in the drive motor 2.

<Problems to be solved by the invention> By the way, the above-mentioned disk mounting device
The reason why the optical disk 6 is received by the thin, large-diameter flange portion 7 is due to the requirement for the arrangement of an optical pickup device that moves from the inner circumferential position to the outer circumferential position of the optical disk 6 in order to reproduce the optical disk 6. This is due to the requirement that the optical disk 6 must be placed in a stable state. In the conventional disk mounting device, the disk receiving member 4 is made of metal in order to obtain sufficient strength for the thin, large-diameter flange portion 7. Therefore, manufacturing the disk receiving member 4 requires complicated metal processing, resulting in a disadvantage that the manufacturing cost and material cost are high.

Further, in the above-mentioned disk mounting device, the disk receiving member 4 is tightened and fixed by the set screw 8, but the pressing force of the set screw 8 is applied to the spindle shaft 3 to which the disk receiving member 4 is attached. If the strength of the spindle shaft 3 is low, there is a possibility that the spindle shaft 3 will be bent. Therefore, it is necessary to use a spindle shaft 3 with a diameter larger than a certain value, and as a result, the drive motor 2 also becomes larger, resulting in an increase in the size of the entire device.

Furthermore, in the conventional disk mounting device, the retaining ring 9 is fitted and fixed to the spindle shaft 3 to hold the centering member 5, so the attachment of the retaining ring 9 is particularly performed with the spring 10 being compressed. As a result, it is not easy to assemble and remove the centering member 5, and the work during manufacturing and maintenance becomes complicated.

Therefore, in view of the above-mentioned circumstances, the present invention makes it possible to easily form each member, assemble and remove them, reduce manufacturing costs, and reduce material costs.
It is another object of the present invention to provide a disk mounting device that can also be made smaller.

<Means for Solving the Problems> In other words, in order to solve the above-mentioned problems, the present invention is made of synthetic resin, has a metal mounting plate attached to its periphery, and has a spindle installed in a hole provided in the center. It has a disk receiving member that press-fits the shaft and is held on the spindle shaft, and a centering member that is made of synthetic resin and is attached to the disk receiving member, and the centering member engages a plurality of engaging pawls provided here. It is adapted to be engaged with and held by the disk receiving member and elastically supported by a spring disposed between the centering member and the disk receiving member.

<Function> With the above-described configuration, the disk receiving member and the centering member can be easily formed by resin molding, and the disk receiving member can be attached without applying local pressure to the spindle shaft, and the centering member can be easily formed by resin molding. can be freely attached to and detached from the centering member by attaching and detaching the engaging claw.

<Examples> Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

The disk mounting device in this embodiment has a first
As shown in the figure, an optical disc player is provided in which an optical pickup device 16 reads and reproduces information signals such as music signals recorded on an optical disc 15.

The above-mentioned optical disk player has a drive motor 18 attached to a chassis 17 by screws or the like, and a disk mounting device attached to a spindle shaft 19 constituting a rotor of the drive motor 18. This disk mounting device faces the disk mounting section provided on the top surface of the optical disk player.
The optical disk 15 is placed on the opening/closing lid 20 that closes the disk mounting portion by opening it. The optical disk 15 placed on the disk mounting device is rotatably provided on the inner wall of the disk mounting device and, for example, the opening/closing lid 20, and as the opening/closing lid 20 is closed, the optical disk 15 is magnetically attached to the disk mounting device side. It is clamped and held by a holding member 21 that is attracted to the holding member 21, and is rotated at high speed by the drive motor 18.

The optical disc player also includes an optical pickup device 16 for reading and reproducing information signals recorded on the rotatably driven optical disc 15.
is provided. This optical pick device 16 is
For example, the optical disk 15 is inserted and supported so as to be freely movable by a pair of guide shafts 22, 22 provided on the chassis 17, and the optical disk 15 is moved along the guide shafts 22, 22 by a drive mechanism (not shown).
is transferred from the inner circumferential side to the outer circumferential side. In this optical pickup device 16, a laser beam from a built-in semiconductor laser is irradiated onto the signal recording surface of the optical disk 15 through an optical system, and the laser beam reflected from the signal recording surface is guided to a photodetector to detect the signal. The pit array formed on the recording surface is read as an information signal.
In this optical pickup device 16, an objective lens 23 is provided on a two-axis drive device 24 that is electromagnetically driven in a focus direction and a tracking direction, and this two-axis drive device 24 performs focus control and tracking of the laser beam. While controlling, the information signal is properly read. In such an optical disc player, the distance between the objective lens 23 of the optical pickup device 16 and the signal recording surface of the optical disc 15 is defined by the focal length of the laser beam. Accordingly, the structure is such that the biaxial drive device 24 that drives the objective lens 23 and the signal recording surface of the optical disk 15 face each other with a small distance G between them.

Furthermore, the structure of the two-axis drive device 24 is as follows:
A magnetic circuit and the like for driving the objective lens 23 are arranged around the objective lens 23. Therefore, when the objective lens 23 tracks the inner recording track of the optical disk 15, the biaxial drive device 24
The inner end of the recording track enters further inside the inner recording track.

The disk mounting device provided in this optical disk player is, as shown in FIG.
It comprises a disk receiving member 25 attached to the spindle shaft 19 and a centering member 26 attached to this disk receiving member 25.

The disk receiving member 25 is formed by injection molding of synthetic resin into a substantially cylindrical container shape having a recess 27 in the center. The distal end side peripheral portion of this disk receiving member 25 has an outward flange portion 28.
is formed, and a metal mounting plate 29 is attached to this flange portion 28. This mounting plate 29 has an annular shape in which the outer periphery is bent upward from the inner periphery by sheet metal processing, and the inner periphery is integrally fixed to the flange 28 by insert molding. It is being Disk receiving member 25 with mounting plate 29 attached in this way
A support mechanism is provided in which the entire circumference of the disk receiving member 25 receives an annular mounting plate 29 which has sufficient strength to not bend under the load when the light receiving disk 15 is held in the sandwiched state. Since I got it,
The stress caused by the above load is not concentrated on one point or one side of the disk receiving member 25, and the optical disk 15 can be received with sufficient strength.

Further, the mounting plate 29 has a substantially maximum diameter within a range that does not interfere with the reading operation of the optical disk 15 by the optical pickup device 16, so that the optical disk 15 can be placed in the most stable state. It's becoming like that. Furthermore, the thickness of the mounting plate 29 is the same as that of the optical pickup device 16.
This is sufficiently smaller than the gap G between the two-axis drive device 24 and the optical disk 15 placed on the disk mounting device. Therefore, when the optical pickup device 16 moves to the innermost position of the optical disk 15, the biaxial drive device 2
4 enters the gap formed on the back side of the mounting plate 29 without coming into contact with the mounting plate 29, and the objective lens 23 is placed on the optical disc 15. It is arranged so that it can face the innermost circumferential recording track portion, and an information signal reading operation can be performed in this inner circumferential portion.

Further, a boss portion 30 is formed at the center of the bottom wall portion of the disk receiving member 25, and a hole portion 31 is formed in the boss portion 30, passing through the disk receiving member 25 in the axial direction. The spindle shaft 19 is press-fitted into the hole 31 of the disk receiving member 25 and is held by the spindle shaft 19 .
The hole 31 and the mounting plate 29 are integrally controlled for accuracy during the above-described molding process, and have high straightness, coaxiality, etc. with each other. Therefore, the disk receiving member 25 is held at an appropriate height position with respect to the optical pickup device 16 using the upper surface of the outer peripheral portion of the mounting plate 29 on which the optical disk 15 is placed as a reference plane.

Further, the bottom wall of the disk receiving member 25 has, for example, three engagement holes 3 as shown in FIG.
2, 32, 32 are formed. These engagement holes 32, 32, 32 are formed in the disk receiving member 25.
It is arranged at positions divided into three parts in the axial direction around the boss part 30, and has a rectangular shape.

The centering member 26 is formed by injection molding of synthetic resin, has an insertion hole 33 in the center, and has a substantially spherical inclined outer circumference around a notched recess 34 provided in the center of the tip. An annular bulge 35 is formed. Further, on the base end side of the centering member 26, there are three engaging pieces 3 formed with engaging claws 36 that engage with the engaging holes 32 of the disk receiving member 25.
7, 37, 37 are provided. The above engaging claw 3
6 protrudes outward, for example, from the tip of each of the engagement pieces 37, and is inserted into each of the engagement holes 32 and engaged with the inner edge of the engagement holes 32.

The centering member 26 formed in this way has the spindle shaft 19 inserted into the insertion hole 33, and the centering member 26 is inserted into the recess 27 of the disk receiving member 25.
With the spring 38 housed in the
Each of the above-mentioned engaging claws 36, 36, 36 is connected to each engaging hole 32,
32, 32, and is attached to the disk receiving member 25. In this state, the centering member 26 is guided by the spindle shaft 19, is supported by the spring 38 so as to be elastically displaceable in the axial direction, and is regulated in position in the radial direction by the spindle shaft 19 so that it can be properly adjusted. placed in the centering position. In addition, each of the above-mentioned engaging claws 36,
36, 36 to open each of the above-mentioned engagement holes 32, 32, 3.
2, the centering member 26 can be removed from the disk receiving member 25. When this removal operation is performed, the resiliency of the spring 38 disposed between the centering member 26 and the disk receiving member 25 ensures that the engaging pawl 36 and the engaging hole 32 are brought into contact with each other. As a result, each engagement claw 36, 36, 3
By sequentially operating 6, the centering member 26 can be removed very easily.

Note that the distal end portions of the respective engaging pieces 37, 37, 37 are formed in a tapered shape, and the respective engaging holes 32, 37 are formed in a tapered shape.
2, 32 and can be easily inserted and engaged.

Further, the optical disc player of this embodiment equipped with the disc mounting device configured as described above is provided with a holding member 21 that clamps and holds the optical disc 15 between it and the disc mounting device. There is. This holding member 21, as shown in FIG.
A cylindrical portion 40 is formed at the center of one side of the pulley body 39, and three engaging pawls 36, 3 are provided at the tip of this cylindrical portion 40.
6 and 36 and a boss portion 42 having a centering taper hole 41 into which the tip of the spindle shaft 19 fits in the center portion of the other side, and a pressure-bonding pulley 43 formed in a disk shape and having a center portion. Three engaging holes 44, 44, 44 are formed in the engaging holes 44, 44, 44, and each of the engaging claws 4 is inserted into these engaging holes 44, 44, 44.
It consists of a yoke plate 45 which is joined to the crimping pulley 43 by engagement of 5, 45 and 45, and an annular magnet 46 which is fixed to the yoke plate 45 and incorporated into the outer periphery of the cylindrical part 40. . The holding member 21 is configured such that the outer peripheral edge of the yoke plate 45 engages with an engaging flange portion 48 of an engaging portion 47 provided on the inner wall of the opening/closing lid 20. When opened, it is engaged and held by the engaging portion 47 and separated from the disk mounting device as the opening/closing lid 20 is moved. Further, when the opening/closing lid 20 is closed, the disc receiving member 2
The mounting plate 29 of No. 5 and the magnet 46 are attracted to each other, and the optical disk 15 is moved onto the mounting plate 2 by the magnetic force.
9 and the crimping pulley 43. In this state, the yoke plate 45 and the engaging portion 47 are separated by a predetermined distance, and the holding member 21 is rotated together with the disk mounting device and the optical disk 15 by the rotation of the spindle shaft 19. . By the way, the opening/closing lid 20 on which the holding member 21 is provided has sufficient strength so that it will not be significantly bent by external force, and the engaging portion 47 and the engaging flange portion 48 are connected to each other while the optical disk 15 is rotating. It is made so that there is no contact.

Note that such a holding member 21 may be rotatably engaged and held by separately providing a member other than the opening/closing lid 20, for example, a member whose position is regulated relative to the chassis 17.

In the optical disc player having the above configuration, the optical disc 15 is held between the mounting plate 29 and the pressure pulley 43 by attracting the mounting plate 29 of the disc mounting device and the magnet 46 of the holding member 21. Optical disk 1
5 is pressed against and held by the disk mounting device, the load applied to the disk mounting device can be reduced. Therefore, the load applied to the spindle shaft 19 that supports the disk mounting device can be reduced, and the wear of the thrust bearing 49 that receives this spindle shaft 19 can also be reduced.

In addition, since a metal mounting plate 29 is provided around the circumference of the disk receiving member 25 made of synthetic resin, it is possible to prevent the disk from coming into contact with the optical pickup device 16 being transferred to the inner peripheral position of the optical disk 15. Even when the mounting plate 29 is formed thin, the optical disk 1
5 with sufficient strength,
A stable mounting state can be obtained by the large-diameter mounting plate 29.

Note that the present invention is not limited to the embodiments described above, and various specific aspects may be adopted, such as the number and shape of the engaging claws 36 and the engaging holes 32.

Further, the present invention is not limited to the optical disc player as explained in the above embodiment, but can be widely applied to various disc players.

<Effects of the Invention> As is clear from the description of the embodiments described above, according to the present invention, a metal mounting plate is provided around the circumference of the disk receiving member made of synthetic resin. Even when the mounting plate is formed thin, it is possible to receive a disk such as an optical disk with sufficient strength, and it is also possible to obtain a stable mounting state using a large diameter mounting plate. Therefore, the disk receiving member can be formed by resin molding, and the disk mounting device can be easily manufactured.

In addition, since a metal mounting plate is provided on the disk receiving member, it is possible to attach this mounting plate with a magnet and provide a holding member that clamps the disk. It is also possible to reduce the load on the spindle shaft to which the mounting device is attached.

Furthermore, since the disc receiving member is press-fitted and held onto the spindle shaft, a local pressing force is applied to the spindle shaft in the radial direction, as in the case where the disc receiving member is attached and fixed with a set screw. There is no chance of being hit. Therefore, there is no risk of the spindle shaft being bent due to the above-mentioned pressing force, and the diameter of the spindle shaft can be made smaller, thereby making it possible to downsize the drive motor and downsize the entire device. obtain.

Furthermore, since the centering member is attached by engaging its engaging claw with the disk receiving member, it is extremely easy to attach and detach, and workability during manufacturing and maintenance is also improved. .

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view illustrating a disk mounting device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the disk mounting device, FIG. 3 is a plan view showing a disk receiving member, and FIG. This figure is an exploded perspective view showing a holding member provided for holding a disk on the disk mounting device, and FIG. 5 is a schematic cross-sectional view showing a conventional disk mounting device. 15... Optical disk, 19... Spindle shaft, 25... Disc receiving member, 26... Centering member, 29... Placement plate, 31... Hole, 3
2...Engagement hole, 36...Engagement claw, 38...Spring.

Claims (1)

[Scope of utility model registration request] A disk receiving member made of synthetic resin and having a metal mounting plate attached to its periphery and a spindle shaft press-fitted into a hole provided in the center and held by the spindle shaft; and a disk receiving member made of synthetic resin and having a metal mounting plate attached to its periphery. a centering member attached to the member, the centering member is held by engaging a plurality of engaging claws provided therein with the disk receiving member, and a space is provided between the centering member and the disk receiving member. A disk mounting device that is elastically supported by arranged springs.