JP4047022B2 - Optical disc cartridge and optical disc apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc cartridge and an optical disc apparatus used for recording or reproducing information.
[0002]
[Prior art]
In general, as shown in FIGS. 11 to 13, an optical disk cartridge a includes an optical disk e having a hub member d that is removably mounted on a rotating part c fixed to a spindle motor b, and an optical disk e in the interior. A cartridge main body f that is rotatably housed, and a one-side facing surface portion f1 (lower surface portion in the drawing) facing the recording surface portion e1 (lower surface portion in the drawing) of the optical disc e, An openable / closable window portion (not shown) that exposes the recording surface portion e1 of the optical disc e to the outside of the cartridge body f, and an openable / closable opening portion (not shown) that exposes the center portion of the optical disc e to the outside. And.
[0003]
The opening is opened until the cartridge body f reaches the position where it overlaps the optical pickup g. When the rotation center (center) of the optical disk e reaches the vicinity of the rotation center of the rotation part c, the rotation part c is moved to the optical disk. 2. Description of the Related Art Conventionally known is an optical disc apparatus g that is made thinner by reducing the extra space in which the cartridge body f moves up and down by approaching e.
[0004]
Specifically, FIG. 11 shows a state where the optical disk cartridge a is inserted into the optical disk apparatus k. In FIG. 11, before the optical disk cartridge a reaches the position where it overlaps the optical pickup g, the opening of the one side facing surface portion (one side facing surface portion f1) of the optical disk cartridge a is open.
[0005]
In FIG. 12, when the optical disk cartridge a is further pushed into the optical disk device g, it overlaps with the optical pickup g, and the rotation center (for example, a ferromagnetic metal disk) of the optical disk e is in the vicinity of the rotation center (rotation axis) of the rotating part c. To reach.
[0006]
FIG. 13 shows a state where the rotating part c approaches the optical disk e from the state shown in FIG. 12 and the optical disk e is mounted on the rotating part c. The rotation part c and the optical disk e are mounted by attracting a permanent magnet (not shown) provided around the rotation shaft to the optical disk e by a magnetic attractive force.
[0007]
Incidentally, the gap inside the optical disk cartridge a used in the optical disk apparatus k is provided to prevent contact between the optical disk e and the cartridge main body f, and the cause described with reference to FIGS. Thus, a predetermined amount is secured in the rotation axis direction of the optical disk e (vertical direction in FIGS. 14 to 16). 14 to 16, the dimension of the MD (mini disk) will be described as an example. The radius of the hub member d (a member corresponding to a ferromagnetic metal disk) is 16.8 mm, and the diameter of the optical disk e is 64 mm. .
[0008]
FIG. 14 shows a case where a gap is provided assuming that the optical disk e is mounted in an inclined manner inside the cartridge body f. The phenomenon in which the optical disk e is mounted in an inclined manner is mainly described. This is caused by the inclination of the rotating part c itself or dust j sandwiched between the hub member d and the rotating part c. In this case, if the diameter of the dust j is 10 μm and the inclination of the rotating part c is 0.1 °, a gap of 0.08 mm or more is required. The broken line in the drawing shows a state in which the optical disk e without deformation is mounted inside the cartridge body f without being inclined.
[0009]
FIG. 15 shows a gap in the case where the optical disk e itself is provided assuming deformation due to warpage caused mainly during manufacturing. The optical disc e is deformed into a bowl shape (deformed upward in the drawing as it goes outward in the radial direction) as shown by a solid line in the figure, or reversed as shown by a virtual line (two-dot chain line) in the figure. It is deformed into a bowl shape (deformed downward in the drawing as it goes outward in the radial direction). In this case, commercially available optical discs such as MD may have a deformation due to warping of about 0.3 mm at the maximum, and in this respect, a gap of 0.3 mm or more is required. The broken line in the drawing shows a state in which an optical disk e without deformation is mounted inside the cartridge body f.
[0010]
FIG. 16 shows a case where the optical disk e is provided on the assumption that the optical disk e is relatively displaced in the rotation axis direction inside the cartridge body f due to variations in the mounting position in the rotation axis direction (vertical direction in the drawing) of the optical disk e. The gap is shown. The phenomenon that the optical disk e is displaced in the direction of the rotation axis is mainly due to the assembly tolerance of the rotating part c and the hub member, the thickness tolerance of the optical disk e, and the optical disk e due to the presence of dust j between the hub member d and the rotating part c. The gap of 0.24 mm or more is required with respect to the standard position of the optical disk e indicated by the broken line in the figure. In FIG. 16, the left side of the alternate long and short dash line indicates a case where the optical disk e, the hub member d, and the rotating portion c are lowered downward relative to the cartridge body f, and the right side of the alternate long and short dash line indicates the optical disk e, The case where the hub member d and the rotating part c are raised upward relative to the cartridge main body f is shown.
[0011]
[Problems to be solved by the invention]
However, as described with reference to FIGS. 14 to 16, a gap is required between the inner surface of the cartridge main body f of the optical disk cartridge a inserted into the optical disk apparatus k and the optical disk e for various reasons. For example, in the optical disc cartridge a for MD, it is necessary to secure a total gap of 0.62 mm or more on the recording surface portion side (lower surface portion side) and the opposite recording surface portion side (upper surface portion side) of the optical disc e.
[0012]
For this reason, the optical disk cartridge a is formed to be thick enough to have a necessary gap due to various causes, and the optical disk cartridge a cannot be thinned.
[0013]
Further, even in the optical disc apparatus k into which such an optical disc cartridge a is inserted, it is not possible to achieve a reduction in thickness by the thick optical disc cartridge a.
[0014]
  The present invention has been made in view of the above points, and an object of the present invention is to reduce the gap between the inner surface of the cartridge body and the optical disk.,lightIt is to achieve a thin disk device.
[0015]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides an optical disc having a hub member attached to a rotating portion fixed to a spindle motor at a central portion, a cartridge main body for rotatably housing the optical disc, and the optical disc. And a window portion that exposes the recording surface portion of the optical disc to the outside of the cartridge body, and an opening portion that exposes the central portion of the optical disc to the outside.Used by inserting into an optical disk deviceAn optical disk cartridge is assumed. And on the inner surface side of the other side facing surface portion of the cartridge body facing the opposite recording surface portion of the optical disc,When the cartridge body is inserted into the optical disc device and the hub member is mounted on the rotating part of the spindle motor,The anti-recording surface of the optical disc is brought into contact withThe optical disk in the direction of its axis of rotation.Position regulating means for regulating the position is provided.
[0016]
  With this particular matter,When the cartridge is inserted into the optical disc device and the hub member is mounted on the rotating part of the spindle motor,Since the position of the anti-recording surface portion of the optical disk is abutted against the position restricting means, the gap between the anti-recording surface portion of the optical disk and the inner surface of the other opposing surface portion of the cartridge body is a position where the anti-recording surface portion of the optical disk contacts The height of the restricting means can be reduced. Further, the gap between the recording surface portion of the optical disc and the inner surface of the one side facing surface portion of the cartridge body can be reduced to a height that allows the maximum amount of deformation due to warpage of the optical disc itself. As a result,lightAchieving thinner disk devicesButIt becomes possible.
[0017]
  here,When the hub member is mounted on the rotating part of the spindle motorWhen the hub member is provided with biasing means for biasing the anti-recording surface portion of the optical disk against the position restricting means, it is possible to eliminate variations and inclinations in the mounting position of the optical disk.
[0018]
In particular, when an elastic member that connects the hub member and the optical disk is applied as the urging means, it is possible to provide the urging means with a simple configuration.
[0019]
On the other hand, when a leaf spring arranged radially at equal intervals in the circumferential direction based on the center of the hub member is applied as the biasing means, the elastic force of the biasing means is applied to the optical disk in the circumferential direction. Therefore, the biasing means can be made thin. In addition, an elastic force can be easily applied to the urging direction, and a structure with less resistance and high rigidity in the rotation direction of the optical disk can be achieved.
[0020]
Further, when the hub member has a layer structure composed of a plurality of layers and an elastic member forming at least one layer of the hub member is applied as the urging means, the structure of the urging means becomes very simple.
[0021]
  In particular, on the inner surface side of the other side facing surface portion of the cartridge main body, on a projecting member protruding on the circumference corresponding to the substantially outer peripheral portion of the anti-recording surface portion of the optical disc, or on the region corresponding to the entire area of the anti-recording surface portion of the optical disc When the protruding projection member is applied as the position regulating means, the optical discthe aboveIt is possible to reduce the sliding resistance when rotating in contact with the position restricting means. And a protruding member protruding on an area corresponding to the entire area of the non-recording surface portion of the optical diskthe aboveWhen provided in the position restricting means, the contact with the protruding member can be surely made regardless of the deformation caused by the warp of the optical disc itself, and the height of the position restricting means (the protruding amount of the protruding member) Can be lowered.
[0022]
  Here, as a position restricting means, a sliding member provided on the inner surface side of the other facing surface portion of the cartridge body and sliding on the non-recording surface portion of the optical disk, or coated on the inner surface side of the other facing surface portion of the cartridge body. When a slidable coating that slides the anti-recording surface of the optical disk is applied,the aboveIt is possible to further reduce the sliding resistance when rotating in contact with the position restricting means. Further, it is possible to effectively prevent the optical disc and the position restricting means from being worn.
[0023]
  When the slidable resin material integrally formed on the inner surface side of the other side facing surface portion of the cartridge main body is applied as the position restricting means, when the cartridge main body is manufactured,the aboveThe position restricting means is formed at the same time, and the position restricting means can be easily formed.
[0024]
  On the other hand, in an optical disk device, an optical diskHub member at the center ofA spindle motor that rotates a rotating part that is detachably mounted, a base frame on which the spindle motor is installed, an optical pickup that records on or reproduces from the optical disk, and the spindle motor, base frame, and light Assuming that it has a housing for storing the pickupTo do. A window for exposing the recording surface portion of the optical disc to the outside of the cartridge main body on one side facing surface portion of the cartridge main body facing the recording surface portion of the optical disc in the optical disc cartridge rotatably storing the optical disc in the cartridge main body; And an opening that exposes the central portion of the optical disk to the outside, and a hub member is disposed on the inner surface of the opposite surface of the cartridge body that faces the non-recording surface of the optical disk. Position restriction means is provided for restricting the position of the optical disk in the direction of the rotation axis by bringing the anti-recording surface portion of the optical disk into contact with the optical disk when the optical disk is mounted. Furthermore,Inside the spindle motor,When the hub member of the optical disc is mounted on the rotating partThere is provided urging means for urging the rotating part toward the optical disk side to elastically support the optical disk.
[0025]
  By this specific matter, HaEven when an optical disk having no biasing means is used in the member, the anti-recording surface of the optical disk is elastically attached to the rotating part by the biasing force of the biasing means. The gap between the anti-recording surface portion of the optical disc and the opposing surface portion facing this can be reduced to the height of the opposing surface portion where the anti-recording surface portion of the optical disk contacts. Further, the gap between the recording surface portion of the optical disc and the opposing surface portion facing the optical disc when mounted on the rotating portion can be reduced to a height that allows the maximum amount of deformation due to warpage of the optical disc itself. As a result, it becomes possible to reduce the thickness of the optical disk device.The
[0026]
In addition, it is possible to eliminate variations and inclinations in the mounting position of the optical disk by the biasing means that biases the rotating part so that the anti-recording surface part of the optical disk is brought into contact with the opposing surface part.
[0027]
Here, a rotating shaft extending inside the spindle motor is provided in the rotating portion, and a clearance is left on the rotating shaft with respect to the bearing inside the spindle motor, and the rotating portion is inclined by the clearance. In the case of allowing rotation while allowing, the bearing accuracy of the spindle motor can be lowered.
[0029]
Furthermore, when an elastic member provided inside the spindle motor is applied as the urging means, the configuration of the urging means for urging the rotating portion can be simplified.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0031]
<First Embodiment>
FIG. 1 shows a schematic configuration of an optical disc apparatus using an optical disc cartridge according to the first embodiment of the present invention.
[0032]
In FIG. 1, reference numeral 1 denotes an optical disc apparatus, and an optical disc cartridge 2 is inserted into the optical disc apparatus 1.
[0033]
The optical disc cartridge 2 includes an optical disc 22 having a hub member 21 attached to a rotating portion 11 fixed to a spindle motor 12 (to be described later) at a central portion (central portion), and a cartridge main body that rotatably accommodates the optical disc 22 therein. 23 and a recording surface portion 22a of the optical disc 22 formed on one side facing surface portion 23a (lower surface portion in FIG. 1) of the cartridge main body 23 facing the recording surface portion 22a (lower surface portion in FIG. 1). Are exposed to the outside of the cartridge body 23 (downward in FIG. 1), and an opening 25 is provided to expose the center of the optical disk 22 outward (downward in FIG. 1). The hub member 21 has a three-layer structure including a metal plate 21 a, an elastic member 21 b as an urging means, and a ferromagnetic metal plate 21 c, and the metal plate 21 a is fixed to the optical disk 22.
[0034]
The optical disk apparatus 1 also includes a spindle motor 12 that rotates the rotating unit 11 on which the optical disk 22 of the optical disk cartridge 2 is mounted, a base frame (not shown) on which the spindle motor 12 is installed, and recording on the optical disk 22. And an optical pickup 14 for reproducing the optical disk 22 and a housing 15 for housing the spindle motor 12, the base frame and the optical pickup 14. A permanent magnet (not shown) is provided inside the rotating part 11. When the ferromagnetic metal plate 21 c is pulled through the opening 25 by the magnetic attractive force of the permanent magnet, the hub member 21 is moved to the rotating part 11. It comes to be installed. When the rotating unit 11 is rotated by the spindle motor 12, the optical disk 22 is rotated by the hub member 21 attached to the rotating unit 11. Further, the optical pickup 14 performs recording on the optical disc 22 and reproduction of the optical disc 22 through the window 24. Reference numeral 16 denotes a circuit board box for storing a circuit board and the like.
[0035]
The inner surface (lower surface in FIG. 1) of the other opposing surface portion 23b (upper surface portion in FIG. 1) of the cartridge body 23 facing the opposite recording surface portion 22b (upper surface portion in FIG. 1) of the optical disk 22 is shown in FIG. As shown, a protrusion member 3 is provided as position restricting means for abutting the anti-recording surface portion 22b of the optical disk 22 to restrict the position of the optical disk 22 in the rotation axis direction Z. The protruding member 3 protrudes only on the circumference corresponding to the outer peripheral portion of the non-recording surface portion 22 b of the optical disk 22 on the inner surface of the other facing surface portion 23 b of the cartridge body 23. The protruding member 3 has a tip end (protruding end) having a substantially semicircular cross section so as to reduce resistance when sliding (rotating) against the anti-recording surface portion 22b of the optical disc 22. .
[0036]
As shown in FIG. 1, the elastic member 21 b of the hub member 21 is installed so as to generate an elastic force mainly in the direction opposite to the recording surface 22 b (upward in FIG. 1) in the rotation axis direction Z of the optical disk 22. ing. As this elastic member 21b, an elastomer, a resin material, a metal spring, or the like is applied. The optical disk 22 is biased toward the protruding member 3 by the elastic force of the elastic member 21b. In other words, the optical disk 22 is restricted to a position where the anti-recording surface portion 22b abuts against the protruding member 3.
[0037]
  The protruding member 3 is formed on the other side facing surface portion 2 of the cartridge body 23.3It is molded integrally with b, and its surface is coated with a member that improves the slidability. Therefore, even if the optical disk 22 rotates while being in contact with the protruding member 3, problems such as wear in actual use do not occur.
[0038]
Next, another operation of the elastic member 21b will be described with reference to FIG.
[0039]
In FIG. 1, the rotating part 11 is mounted in an inclined state due to mechanical tolerances such as component dimensional tolerances and assembly tolerances, and dust F is sandwiched between a part between the rotating part 11 and the hub member 21. Is shown. In this case, the ferromagnetic metal plate 21 c of the hub member 21 is mounted in an inclined state with respect to the rotating portion 11. At this time, the elastic member 21b is elastically deformed by its stretchability, so that the metal plate 21a is pushed up toward the side opposite to the recording surface 22b in the rotation axis direction Z of the optical disk 22 while absorbing the inclination of the ferromagnetic metal plate 21c. ing. That is, even if the ferromagnetic metal plate 21c is mounted in an inclined state with respect to the rotating portion 11, the metal plate 21a and the optical disk 22 do not follow the above-described inclined state due to the intervention of the elastic member 21b. It will be kept in a regulated position. Therefore, in the optical disc apparatus 1 of the present embodiment, the gap S1 between the non-recording surface portion 22b of the optical disc 22 and the inner surface of the other opposite surface portion 23b of the cartridge body 23 can be reduced to the protruding height of the protruding member 3. 1 shows a case where both the inclination of the rotating part 11 and the inclination due to the dust F are generated, but even when the inclination of the rotating part 11 and the inclination due to the dust F are generated independently. Similarly, the ferromagnetic metal plate 21c is attached to the rotating portion 11 in an inclined state.
[0040]
Here, the protruding height of the protruding member 3 will be described with reference to FIG.
[0041]
In FIG. 3, the cross section of the optical disk 22 deformed into an inverted bowl shape (deformed downward in the drawing as it goes outward in the radial direction) is indicated by a solid line, and the optical disk 22 is accommodated in the cartridge body 23. A cross section of the optical disk cartridge 2 inserted into the optical disk apparatus 1 is shown.
[0042]
The deformed shape of the optical disk 22 is occasionally present when the optical disk 22 is formed of a plastic material. In FIG. 3, a cross section of the optical disk 22 that has been deformed into a bowl shape (deformed upward in the drawing as going outward in the radial direction) is indicated by a broken line. In FIG. 3, the hub member 21 and the optical pickup 14 are described only in the case of the optical disk 22 deformed into an inverted bowl shape in order to prevent the drawing from being complicated.
[0043]
In this case, since the deformation amount due to the warp of the optical disk 22 is 0.3 mm at the maximum, the protruding height of the protruding member 3, that is, the gap S1 may be 0.3 mm or more.
[0044]
Next, as shown in FIG. 4, a gap S2 between the recording surface portion 22a of the optical disk 22 and the inner surface of the cartridge body 23 on one side facing surface 23a (a gap below the optical disk 22 inside the cartridge body 23 in FIG. 4). ) Will be described.
[0045]
In FIG. 4, it is deformed into a bowl shape (warping upward in the drawing as it goes radially outward in one diametrical direction, and as it goes radially outward in another diametrical direction perpendicular to the diametrical direction) The cross section shows a state in which the optical disk cartridge 2 in which the optical disk 22 that has been warped downward and is lowered) is inserted into the optical disk apparatus 1 is housed in the cartridge body 23. In FIG. 4, the outer peripheral portion that warps upward in the drawing that appears in one diametrical direction of the optical disk 22 and the cross section in the vicinity of the inner periphery are shown by solid lines, and the outer peripheral portion that hangs downward in the drawing that appears in the other linear direction. It is indicated by a broken line. In this case, the outer peripheral portion that warps upward from the optical disk 22 is in contact with the protruding member 3.
[0046]
Here, the deformation amount due to the warp of the optical disc 22 is 0.3 mm at the maximum due to the upward warping, and 0.3 mm at the maximum due to the sagging downward. In the state, a deformation of 0.6 mm at maximum is generated below the optical disk 22 except for the thickness of the optical disk 22. That is, the gap S2 between the recording surface portion 22a of the optical disc 22 and the inner surface of the cartridge body 23 on the one side facing surface portion 23a may be 0.6 mm or more. In this case, if the optical disk 22 deformed in a bowl shape is used, the amount of deformation below the optical disk 22 is maximized.
[0047]
According to the above, the gap between the optical disc and the cartridge main body of 0.62 mm or more which has been conventionally required is reduced by about 0.32 mm above the optical disc 22 and about 0.02 mm below the optical disc 22 in this embodiment. it can. In other words, the optical disc cartridge 2 and the optical disc apparatus 1 can be made thinner by the amount that the gap is reduced.
[0048]
  Further, since the optical disk 22 abuts against the protruding member 3, the optical disk 22 is positioned upward in the cartridge main body 23. Therefore, in the cartridge body 23, the lower part of the optical disk 22 is rotated more than the upper part of the optical disk 22.axisA large space exists in the direction Z. For this reason, in this embodiment, the optical pickup 14 enters the large space below the optical disk 22 through the window 24, so that the installation space for the optical pickup can be shared with the large space below the optical disk 22, and the further optical disk device 1 can be used. Can be made thinner.
[0049]
<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0050]
In this embodiment, the configuration of the protruding member is changed. The other configurations except for the protruding members are the same as those in the first embodiment, and the same portions are denoted by the same reference numerals and the description thereof is omitted.
[0051]
That is, in the present embodiment, a plurality of projecting members 4,. I have. Each of the protruding members 4 has a minute hemispherical shape, and is formed integrally and densely with respect to the inner surface of the other opposing surface portion 23b of the cartridge body 23 on a region corresponding to the entire area of the non-recording surface portion 22b of the optical disk 22. Has been.
[0052]
Further, FIG. 6 shows a cross section of the optical disk 22 deformed into a bowl shape by a solid line and a cross section of the optical disk 22 deformed into an inverted bowl shape by a broken line. A cross section of the optical disk cartridge 2 housed therein is shown in the state of being inserted into the optical disk apparatus 1. In FIG. 6, the hub member 21 and the optical pickup 14 are described only in the case of the optical disk 22 deformed into a bowl shape in order to prevent the drawing from being complicated.
[0053]
The optical disk 22 is biased in a direction (upward in FIG. 6) in contact with each protruding member 4 by the elastic force of the elastic member 21b. In this case, when the optical disk 22 is deformed into a bowl shape, the outer peripheral portion of the optical disk 22 abuts against each protruding member 4, and when the optical disk 22 is deformed into an inverted bowl shape, the inner circumference of the optical disk 22 is deformed. The portion comes into contact with each protruding member 4.
[0054]
Here, if the protruding height of each protruding member 4 is 0.02 mm, for example, the gap S1 between the non-recording surface portion 22b of the optical disc 22 and the inner surface of the other opposite surface portion 23b of the cartridge body 23 is 0.02 mm. .
[0055]
As described above, in the present embodiment, the gap S1 between the anti-recording surface portion 22b of the optical disc 22 and the inner surface of the other opposing surface portion 23b of the cartridge main body 23 is the gap 0 between the optical disc and the cartridge main body, which is conventionally required. It can be reduced by about 0.6 mm for .62 mm or more. In other words, the optical disc cartridge 2 and the optical disc apparatus 1 can be reduced in thickness by the amount of reduction of the gap (0.6 mm).
[0056]
  In the present embodiment, a plurality of projecting members 4,... Projecting on a circular area corresponding to the entire area of the non-recording surface portion 22b of the optical disc 22 on the inner surface of the other side facing surface portion 23b of the cartridge body 23 are used as position restricting means. Although applied, as a position regulating means, a sliding member that slides the anti-recording surface portion of the optical disc, or a slidable coating that is coated on the inner surface side of the other opposing surface portion of the cartridge body and slides the anti-recording surface portion of the optical disc In this case, the optical discthe aboveThe sliding resistance when rotating in contact with the position restricting means can be further reduced, and wear of the optical disc and the position restricting means can be effectively prevented. Further, as the position regulating means, a slidable resin material integrally formed on the inner surface side of the other facing surface portion of the cartridge body may be applied. In this case, at the time of manufacturing the cartridge bodythe aboveThe position restricting means is formed at the same time, and the position restricting means can be easily formed.
[0057]
<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS.
[0058]
In this embodiment, the configuration of the urging means is changed. The rest of the configuration excluding the urging means is the same as in the first embodiment, and the same parts are denoted by the same reference numerals and description thereof is omitted.
[0059]
That is, in this embodiment, as shown in FIG. 7, the optical disk 22 has a plurality of leaf springs 35,... As biasing means extending radially at equal intervals in the circumferential direction based on the center of the hub member 26. The optical disk 22 and the hub member 26 are elastically connected by the plate springs 35. The optical disk 22 has a hollow portion 36 made of a regular polygon (regular dodecagon in the figure) on its inner peripheral portion, and the hub member 26 is also a regular polygon (regular dodecagon) similar to the hollow portion 36. ). The plate springs 35 connect the opposite sides of the cut-out portion 36 and the hub member 26 to each other, and the elastic force of the plate springs 35 causes the optical disk 22 to be attached to the inner surface of the other side facing surface portion 23b of the cartridge body 23. It is configured so as to be urged in the direction of contact (upward in FIG. 6). In this case, the opposed sides of the cut-out portion 36 and the hub member 26 are parallel to each other, and each leaf spring 35 is likely to generate an elastic force.
[0060]
FIG. 8 is a cross-sectional view showing a state in which the optical disk 22 is housed in the cartridge main body 23 having the protruding members 4 on the inner surface of the other side facing surface portion 23 and inserted into the optical disk apparatus 1.
[0061]
Here, the optical disk 22 is a flat disk that is not deformed by warping, and shows a state in which the anti-recording surface portion 22 b is in contact with each protruding member 4 by being urged upward by each leaf spring 35. Each leaf spring (biasing means) can be applied even when the optical disk 22 is deformed into a bowl shape, a reverse bowl shape, a bowl shape, or other shapes.
[0062]
<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
[0063]
In this embodiment, the configuration of the urging means is changed. The rest of the configuration excluding the urging means is the same as in the first embodiment, and the same parts are denoted by the same reference numerals and description thereof is omitted.
[0064]
That is, in this embodiment, as shown in FIG. 9, the spindle motor 19 includes a rotating portion 19a, a bearing portion 19b, a magnet 19c installed on the rotating portion 19a, a stator portion 19d, and the like. Further, the central portion of the rotating portion 19a extends downward in the drawing and serves as a rotating shaft 19e of an integrated spindle motor 19. The rotating portion 19a is urged toward the optical disk 22 side (upward in the drawing) from directly below the rotating shaft 19e by a coil spring 51 as urging means. The stator portion 19d and the bearing portion 19b are fixed to the housing 15 of the optical disc apparatus 1. Further, the clearance between the rotary shaft 19e and the bearing portion 19b is ensured to be larger than that of a normal motor, and the rotary portion 19a rotates while allowing the tilt to the bearing portion 19b using the clearance. Is now possible. A hub member 27 made of a ferromagnetic metal plate is fixed to the optical disk 22, and the hub member 27 rotates by being attracted by a magnetic attraction force of a permanent magnet (not shown) installed inside the rotating portion 19a. It is designed to be attached to the part 19a. When the rotating portion 19a is pressed toward the optical disk 22 (upward in the drawing) by the coil spring 51, the hub member 27 is also pressed in the same manner. As a result, the optical disk 22 is urged by the protruding member 3 and rotates while abutting. The height of the protruding member 3 is appropriately set to 0.3 mm or more. Therefore, the gap S1 between the anti-recording surface portion 22b of the optical disk 22 and the inner surface of the other opposite surface portion 23b of the cartridge body 23 may be 0.3 mm or more, and the gap between the optical disk and the cartridge body, which has been conventionally required. A reduction of about 0.32 mm is possible with respect to 0.62 mm or more. In other words, the optical disc cartridge 2 and the optical disc apparatus 1 can be reduced in thickness by the amount of reduction of the gap (0.32 mm).
[0065]
In the present embodiment, the protrusion member 3 as the position restricting means is provided on the inner surface of the other facing surface portion 23b of the cartridge body 23. However, the anti-recording surface portion 22b of the optical disk 22 is formed on the inner surface of the other facing surface portion 23b of the cartridge body 23. There may be provided a plurality of projecting members 4,... As position restricting means projecting on a region corresponding to the entire area. In this case, the gap S1 between the non-recording surface portion 22b of the optical disc 22 and the inner surface of the other side facing surface portion 23b of the cartridge body 23 can be set to about 0.02 mm.
[0066]
As described in the first embodiment, when the dust F is present between the hub member 21 and the rotating part 11, the hub member 21 is mounted to be inclined with respect to the rotating part 11, and the optical disk 22. Will follow the slope. The same applies to the case where the lower surface 21a of the hub member 21 is inclined due to mechanical tolerances, etc., and the optical disk 22 follows the inclination. On the other hand, in the present embodiment, as shown in FIG. 10, the rotation part 19a is inclined by itself by securing a larger clearance between the rotation shaft 19e and the bearing part 19b than that of a normal motor. It is configured to enable rotation with shake. For the above reason, when the optical disc 22 and the rotating portion 19a are relatively inclined, the anti-recording surface portion 22b of the optical disc 22 is positioned by the optical spring 22 coming into contact with the protruding member 3 by the coil spring 51. The rotating part 19a is configured to be able to relatively tilt using the clearance. That is, when the rotating part 19a tilts itself, the optical disk 22 rotates in a state of contacting the protruding member 3 while absorbing the relative inclination between the optical disk 22 and the rotating part 19a. Accordingly, the optical disc 22 does not run out due to rotation, and the gap S1 between the anti-recording surface portion 22b of the optical disc 22 and the inner surface of the other side facing surface portion 23b of the cartridge body 23 is maintained at the height (projection amount) of the protruding member 3. Will be able to.
[0067]
When the diameter of the rotating part 19a and the hub member 27 is 16.8 mm and the inclination angle of the lower surface 27a of the hub member 27 is 0.1 ° at the maximum, the inclination of the rotating part 19a when dust F having a diameter of 10 μm is present. The maximum angle is 0.14 °.
[0068]
In the case of the small-diameter optical disk 22 having a diameter of 50 mm or 30 mm, the hub member 27 has a small diameter of about 5 mm. In this case, if considered in the same manner as described above, the maximum amount of inclination of the rotating portion 19a is 0.22 °.
[0069]
In this case, since the clearance is appropriately set according to the amount of inclination (inclination angle) of the rotating portion 19a, the amount of inclination of the rotating portion 19a is as small as 0.14 ° or 0.22 °. If the length of the rotary shaft 19e to be used is about 1.5 mm to 3 mm, it may be about the same as the clearance of a normal spindle motor, and the performance of the spindle motor 19 is not impaired.
[0070]
The gap S2 between the recording surface portion 22a of the optical disk 22 and the inner surface of the one side facing surface portion 23a of the cartridge main body 23 is the same as in the first to third embodiments.
[0071]
Also, in common with the first to fourth embodiments, biasing means (elastic member 21b, leaf spring 35 or coil spring 51) is provided on any of the hub members 21, 26, 27, the optical disk 22, and the spindle motor 19. Thus, since the optical disk 22 is brought into contact with the position restricting means (the projecting member 3 or 4), the variation in the mounting position of the optical disk 22 in the direction of the rotation axis is eliminated as in the conventional apparatus.
[0072]
Further, in each of the above embodiments, the protrusion members 3, 4 and the like as the position regulating means are provided on the inner surface of the one side facing surface portion 23a of the cartridge body 23. However, when the optical disk is not mounted on the cartridge body, that is, the hub member is used. In an optical disc that is not provided, it can be applied by providing a position restricting means such as a protruding member on the opposite surface portion of the housing of the optical disk device that faces the non-recording surface portion of the optical disc, thereby varying the mounting position of the optical disc. Further, the inclination can be eliminated, and the gap (S1) between the anti-recording surface portion of the optical disk and the inner surface of the opposite surface portion of the housing can be reduced to the height of the position restricting means.
[0073]
【The invention's effect】
  As described above, in the present invention, when the cartridge body is inserted into the optical disc apparatus and the hub member is mounted on the rotating portion of the spindle motor, the position of the anti-recording surface portion of the optical disc is brought into contact with the position regulating means to regulate the position. A gap between the anti-recording surface portion of the optical disk and the inner surface of the opposite side surface of the cartridge body.the aboveIn addition to reducing the height of the position restricting means, the gap between the recording surface of the optical disk and the inner surface of the one side facing surface of the cartridge body is reduced to the maximum allowable amount of deformation due to the warpage of the optical disk itself, thereby reducing the thickness of the optical disk apparatus. Can be achieved.
[0074]
  Also,When the hub member is attached to the rotating part of the spindle motorBy providing the hub member with an urging means for bringing the anti-recording surface portion of the optical disk into contact with the position regulating means, it is possible to eliminate variations and inclinations in the mounting position of the optical disk.
[0075]
In particular, by applying an elastic member that connects the hub member and the optical disk as the biasing means, a biasing means having a simple configuration can be provided.
[0076]
On the other hand, by applying leaf springs arranged radially at equal intervals in the circumferential direction based on the center of the hub member as an urging means, the elastic force can be uniformly transmitted from the circumferential direction to the optical disk. In addition, the biasing means can be made thin. In addition, it is possible to easily apply an elastic force to the urging direction, and to suppress the resistance with respect to the rotation direction of the optical disc, thereby achieving a highly rigid structure.
[0077]
Further, by applying at least one elastic member of the hub member as the urging means, the structure of the urging means can be made very simple.
[0078]
  In particular, by applying a projecting member on the circumference corresponding to the substantially outer peripheral portion of the anti-recording surface portion of the optical disc, or a projecting member on the region corresponding to the entire region of the anti-recording surface portion of the optical disc as the position regulating means,the aboveThe sliding resistance of the optical disk rotating in contact with the position restricting means can be reduced. Then, according to the protruding member on the region corresponding to the entire area of the anti-recording surface portion of the optical disk, the contact with the protruding member can be surely performed regardless of the deformation due to the warp of the optical disk itself, and the height of the position restricting means can be lowered. Can do.
[0079]
Here, when a sliding member that slides the anti-recording surface portion of the optical disk or a slidable coating that slides the anti-recording surface portion of the optical disk is applied as the position restricting means, it rotates when contacting the position restricting means. The sliding resistance of the optical disk can be further reduced. Further, it is possible to effectively prevent the optical disc and the position restricting means from being worn.
[0080]
  And, by applying the slidable resin material integrally formed on the inner surface side of the other side facing surface portion of the cartridge body as the position regulating means, at the time of manufacturing the cartridge bodythe aboveThe position restricting means can be formed at the same time, and the position restricting means can be easily formed.
[0081]
  On the other hand, in an optical disk device,When a cartridge body provided with position restricting means for restricting the position of the optical disk in the direction of its rotation axis is inserted into the optical disk apparatus and a hub member is mounted on the rotating part of the spindle motorInside the spindle motorBy the biasing means providedElastic support of optical discRukoAnd the hub partLight without biasing means in the materialEven in the case of a disc, the gap between the anti-recording surface portion and the facing surface portion of the optical disc mounted on the rotating portion is reduced to the height of the facing surface portion, and the gap between the recording surface portion and the facing surface portion of the optical disc itself is reduced. Reduce the maximum amount of deformation due to warpage to the allowable height.,Achieving thinner optical disk devicesButit can.
[0082]
In addition, it is possible to eliminate variations and inclinations in the mounting position of the optical disc by the biasing means that biases the rotating portion so that the opposite recording surface portion of the optical disc contacts the opposing surface portion.
[0083]
Here, the rotation shaft extending inside the spindle motor has a clearance with respect to the bearing inside the spindle motor, and the rotation of the spindle motor is allowed to rotate while allowing the inclination of the rotating portion by this clearance. Bearing accuracy can be lowered.
[0085]
Furthermore, by applying the elastic member inside the spindle motor as the urging means, the configuration of the urging means for urging the rotating portion can be simplified.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an optical disk device showing a state where an optical disk cartridge according to a first embodiment of the present invention is mounted.
FIG. 2 is a perspective view showing a protruding member on the inner surface of the other opposing surface portion of the cartridge body.
FIG. 3 is a cross-sectional view of the optical disc apparatus showing a state in which an optical disc cartridge in which an optical disc deformed into a reverse bowl shape and a bowl shape is housed in a cartridge body is inserted.
FIG. 4 is a cross-sectional view of the optical disc apparatus showing a state where an optical disc cartridge in which an optical disc deformed into a bowl shape is housed in the cartridge body is inserted.
FIG. 5 is a perspective view showing a protruding member on the inner surface of the other opposite surface portion of the cartridge body in the optical disc cartridge according to the second embodiment of the present invention.
FIG. 6 is a cross-sectional view of the optical disk device showing a state in which an optical disk cartridge in which an optical disk deformed into a reverse bowl shape and a bowl shape is accommodated in the cartridge body is inserted.
FIG. 7 is a plan view of an optical disc and a hub member viewed from the other side in a state in which the opposite surface portion of the cartridge body is removed in an optical disc cartridge according to a third embodiment of the present invention.
FIG. 8 is a cross-sectional view of the optical disc apparatus showing a state where an optical disc cartridge is similarly mounted.
FIG. 9 is a cross-sectional view of an optical disk device showing a state where an optical disk cartridge according to a fourth embodiment of the present invention is mounted.
FIG. 10 is a cross-sectional view of the optical disc apparatus showing a state where the optical disc cartridge is mounted in a state where dust is interposed between the rotating portion and the hub member.
FIG. 11 is a cross-sectional view of an optical disc apparatus showing a state in which an optical disc cartridge according to a conventional example is inserted.
FIG. 12 is a cross-sectional view of the optical disc apparatus showing a state where the optical disc cartridge is further pushed into the interior.
FIG. 13 is a cross-sectional view of the optical disc apparatus showing a state where the optical disc is mounted on the rotating unit.
FIG. 14 is a cross-sectional view of the optical disc cartridge showing a state in which the optical disc is similarly inclined and mounted in the cartridge body.
FIG. 15 is a cross-sectional view of an optical disk cartridge showing a state in which an optical disk deformed into a reverse bowl shape and a bowl shape is housed inside the cartridge body.
FIG. 16 is a cross-sectional view of the optical disc cartridge showing a state in which the optical disc is housed while being relatively displaced in the rotation axis direction inside the cartridge body.
[Explanation of symbols]
1 Optical disk device
11, 19a Rotating part
19e Rotating shaft
12 Spindle motor
14 Optical pickup
15 housing
2 Optical disk cartridge
21, 26, 27
Hub member
21b Elastic member (biasing means)
22 Optical disc
22a Recording surface
22b Anti-recording surface
23 Cartridge body
23a One side facing surface part
23b Other side facing surface
24 windows
25 opening
3 Protruding member (position regulating means)
35 Leaf spring (biasing means)
4 Protruding member (position regulating means)
51 Coil spring (biasing means, elastic member)

Claims (11)

An optical disc having a hub member attached to a rotating portion fixed to a spindle motor at the center, a cartridge main body for rotatably storing the optical disc therein, and a one-side facing surface portion of the cartridge main body facing the recording surface portion of the optical disc In the optical disc cartridge, which is formed and is provided with a window portion that exposes the recording surface portion of the optical disc to the outside of the cartridge body, and an opening portion that exposes the central portion of the optical disc to the outside.
On the inner surface side of the opposite side surface portion of the cartridge body facing the opposite recording surface portion of the optical disk, when the cartridge body is inserted into the optical disk device and a hub member is mounted on the rotating portion of the spindle motor, Position restriction means for restricting the position of the optical disk in the direction of the rotation axis by contacting only the non-recording surface portion is provided,
The aforementioned hub member, the hub member is biasing means is provided for urging so as to abut only anti recording surface of the optical disk when mounted on the rotating portion of the spindle motor with respect to the position regulating means An optical disc cartridge characterized by comprising: In the optical disk cartridge according to claim 1,
An optical disc cartridge, wherein an elastic member for connecting the hub member and the optical disc is applied as the urging means. In the optical disk cartridge according to claim 1,
An optical disc cartridge characterized in that as the biasing means, leaf springs arranged radially at equal intervals in the circumferential direction based on the center of the hub member are applied. In the optical disk cartridge according to claim 1,
The hub member has a layer structure composed of a plurality of layers,
An optical disc cartridge, wherein an elastic member forming at least one layer of the hub member is applied as the urging means. In the optical disk cartridge according to any one of claims 1 to 4,
The position restricting means corresponds to a protruding member projecting on the circumference corresponding to the substantially outer peripheral portion of the anti-recording surface portion of the optical disc on the inner surface side of the other opposing surface portion of the cartridge body, or the entire area of the anti-recording surface portion of the optical disc. An optical disc cartridge, characterized in that a projecting member protruding on the area is applied. In the optical disk cartridge according to claim 5,
An optical disc cartridge, characterized in that a sliding member that is provided on the inner surface side of the other opposing surface portion of the cartridge body and slides the anti-recording surface portion of the optical disc is applied as the position restricting means. In the optical disk cartridge according to claim 5,
An optical disc cartridge characterized in that as the position regulating means, a slidable coating is applied which is coated on the inner surface side of the other facing surface portion of the cartridge body and slides on the non-recording surface portion of the optical disc. In the optical disk cartridge according to claim 5 or 6,
An optical disc cartridge, wherein a slidable resin material integrally formed on the inner surface side of the opposite side surface portion of the cartridge body is applied as the position restricting means. A spindle motor that rotates a rotating part in which a hub member at the center of the optical disk is detachably mounted, a base frame on which the spindle motor is installed, an optical pickup that performs recording on the optical disk or reproduction of the optical disk, In an optical disk apparatus comprising the spindle motor, a base frame, and a housing for storing an optical pickup,
The optical disk cartridge that rotatably stores the optical disk in the cartridge body includes a window portion that exposes the recording surface portion of the optical disk to the outside of the cartridge body at one side facing surface portion facing the recording surface portion of the optical disk. And an opening that exposes the central portion of the optical disk to the outside, and
When the hub member is attached to the rotating part of the spindle motor, only the anti-recording surface part of the optical disk is brought into contact with the inner surface side of the other opposing surface part of the cartridge body facing the anti-recording surface part of the optical disk. Position restricting means for restricting the position of the optical disc in the direction of the rotation axis is provided,
Inside of the spindle motor, biases the rotational portion as the hub member of the optical disk causes only anti recording surface of the optical disk when mounted on the rotating portion abuts against said position regulating means to the optical disk side And an urging means for elastically supporting the optical disk. In the optical disk device according to claim 9,
The rotating part has a rotating shaft extending inside the spindle motor,
This rotating shaft has a clearance with respect to the bearing inside the spindle motor,
An optical disc apparatus characterized in that the rotating portion rotates while allowing an inclination by the clearance. In the optical disk device according to claim 9 or 10,
An optical disc apparatus characterized in that an elastic member provided inside a spindle motor is applied as the biasing means.

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