JP3920189B2 - Information recording / reproducing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information recording / reproducing apparatus.
[0002]
[Prior art]
A conventional information recording / reproducing apparatus loads an optical disc-like recording medium (hereinafter referred to as an optical disc) such as a CD or a DVD, reproduces information recorded on the optical disc, or records information on the optical disc.
[0003]
Loading of the optical disk into the information recording / reproducing apparatus is performed as follows.
[0004]
The optical disk is loaded into the information recording / reproducing apparatus by a loading mechanism provided in the information recording / reproducing apparatus. When the optical disk is loaded into the information recording / reproducing apparatus, the chassis turns the turntable on the loaded optical disk around the fulcrum in the information recording / reproducing apparatus to chuck the optical disk on the turntable provided in the chassis of the information recording / reproducing apparatus. Rotate to approach. By rotating the chassis, the turntable is brought close to the loaded optical disk, and the optical disk is clamped by sandwiching the optical disk between the magnet of the turntable and the magnetic body built in the clamper, and the optical disk is loaded.
[0005]
Further, in this information recording / reproducing apparatus, an objective lens for condensing a light beam used for recording / reproducing information on a loaded optical disk is provided. The objective lens is held by a lens holder, supported by a guide made of an elastic support member and the like so as to be movable in the focusing and tracking directions, and moved in the direction of gravity by the weight of the movable part including the objective lens and the lens holder.
[0006]
For example, when a leaf spring or a wire is used as the elastic support member used here, the movement amount due to its own weight is related to the value of the primary resonance frequency, but is generally about 0.2 mm to 0.4 mm. Further, the working distance between the optical disk and the objective lens (working distance) and the distance between the optical disk and the objective lens due to its own weight are generally about 0.3 mm to 0.5 mm.
[0007]
By the way, until the optical disk is completely clamped, there is a case where the optical disk is clamped with a tilt from a normal clamping state. In this case, the set value of the distance between the objective lens and the distance between the optical disk and the objective lens described above may cause the optical disk to contact the objective lens and damage the objective lens or the optical disk as shown in FIG. Reference numeral 91 in the figure indicates an optical disk, reference numeral 92 indicates a turntable, reference numeral 93 indicates an objective lens, reference numeral 94 indicates an optical pickup, and reference numeral 95 indicates a guide shaft.
[0008]
Further, due to an impact generated when the optical disk is clamped, the objective lens moves in a direction toward the clamped optical disk due to the reaction, and damages the objective lens or the optical disk. Further, when the information recording / reproducing apparatus is subjected to an impact, for example, when the information recording / reproducing apparatus is dropped, for example, when the power is turned off, the objective lens moves in the direction toward the clamped optical disk and contacts the optical disk. Damage.
[0009]
Therefore, an objective lens driving device that avoids collision between the objective lens and the optical disk has been proposed (see, for example, Patent Documents 1 and 2).
[0010]
In the case of the objective lens driving device described in Patent Document 1, in order to avoid damage to the optical disk and the objective lens, the stopper member formed of a silicon resin material is provided so that the upper surface thereof is higher than the vertex of the objective lens. Yes. However, in this objective lens driving device, the loaded optical disc and the stopper member provided on the movable portion side of the shock when the optical disc is clamped or when the impact is applied to the information recording / reproducing device when the power is turned off. Collisions cannot be avoided. Therefore, forcible addition is applied to the leaf spring or the wire that supports the movable part, and the objective lens driving device may be damaged.
[0011]
Further, in the case of the objective lens driving device described in Patent Document 2, the loading optical disc and the objective are moved by moving the movable part holding the objective lens away from the optical disc between the start and the end of the loading operation. Contact with the lens can be avoided. However, in this objective lens driving device, it is necessary to set the movable amount of the movable portion within a range of sufficient movable amount in the direction away from the optical disk, and it is necessary to enlarge the magnetic circuit in order to operate this movable portion. is there. For this reason, this increases the cost due to the increase in the magnet size and hinders the downsizing of the device due to the increase in the size of the objective lens driving device. Further, in the case of an objective lens driving apparatus that employs a system in which the movable part is supported by a leaf spring or a wire, the support member may be plastically deformed by adding the leaf spring or the wire by moving the movable part greatly. Further, since the movable portion is retracted electrically upon receiving a loading operation start signal, the operation may not be performed due to a system malfunction or the like. In addition, since this objective lens driving device is configured to electrically retract the movable portion in response to a loading operation start signal, at the time of impact on the objective lens driving device when the power is turned off, A collision between the objective lens and the loaded optical disk cannot be avoided.
[0012]
[Patent Document 1]
JP 2001-319355 A
[Patent Document 2]
JP-A-3-52123
[0013]
[Problems to be solved by the invention]
Therefore, in order to solve the above problems, the present invention provides an objective lens even when a disc-shaped recording medium is loaded, when recording / reproducing is not performed on the loaded disc-shaped recording medium, and when the apparatus is turned off. It is an object of the present invention to provide an information recording / reproducing apparatus having a small and simple configuration that reliably avoids a collision between a disk and a disk-shaped recording medium.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, an information recording / reproducing apparatus according to the present invention comprises a holding unit for holding a disc-shaped recording medium for recording / reproducing information, and a rotating unit for rotating the disc-shaped recording medium held by the holding unit. In the information recording / reproducing apparatus in which the rotation holding unit and the pickup unit for recording / reproducing information on the disc-shaped recording medium held by the holding unit are provided in the chassis, the rotation holding unit is connected to the holding unit. A moving means for moving in a direction perpendicular to the surface of the held disc-shaped recording medium is provided, and by this movement, the distance between the surface of the disc-shaped recording medium held in the holding unit and the pickup unit is adjusted, In a state where the disc-shaped recording medium held in the holding unit by the moving unit is brought close to the pickup unit and information can be recorded / reproduced, the moving hand Characterized by comprising a non-contact state with the rotating part and.
[0015]
According to the present invention, the rotation holding unit, the pickup unit, and the moving unit are provided, and when the information recording / reproducing state is enabled, the moving unit and the rotation unit are in a non-contact state, and thus are held by the pickup unit. It is possible to increase the distance between the objective lens and the surface of the disc-shaped recording medium held on the holding unit by the moving means except when recording and reproducing information from the disc-shaped recording medium held on the unit. And a disc-shaped recording medium held in the holding unit can be avoided. In particular, the effect is remarkable in a high-density information recording / reproducing apparatus having a small working distance (working distance) between the disc-shaped recording medium and the objective lens. Further, according to the present invention, it is possible to rotate the disc-shaped recording medium held by the holding unit without being affected by the load caused by the contact with the moving means.
[0016]
In the above configuration, the moving means may contact the rotating portion at a plurality of locations thereof to move the rotation holding portion in a direction perpendicular to the surface of the disk-shaped recording medium.
[0017]
In this case, since the moving means abuts on the rotating portion at a plurality of locations thereof, it is possible to move without tilting in a direction perpendicular to the surface of the disc-shaped recording medium as compared with the case of abutting at one point. . Further, compared to the case where the rotation holding portion is moved in the vertical direction at one point, it is possible to prevent wear caused by sliding between the rotation portion and the bearing due to the vertical movement.
[0018]
In the above configuration, the rotating portion is provided with a bearing plate that directly contacts the moving means, and is provided with a rod-shaped rotating shaft extending in the vertical direction, the tip of which is formed in a hemispherical shape. By moving the tip of the rotating shaft in contact with the bearing plate, the rotational holding portion can be moved in a direction perpendicular to the surface of the disc-shaped recording medium held by the holding portion. Good.
[0019]
In this case, since the bearing plate and the rotary shaft are simultaneously vertically moved (lifted / lowered) via the bearing plate of the rotating unit, the rotating unit can be rotated even when the rotating unit is raised, and the pickup unit is focused. It becomes possible to bring the disc-shaped recording medium closer to the pickup unit, and it is possible to further prevent collision between the disc-shaped recording medium and the pickup unit.
[0022]
In the above configuration, after the disc-shaped recording medium is held by the holding unit, the rotation holding unit is moved by the moving unit in a direction perpendicular to the surface of the disc-shaped recording medium held by the holding unit. Also good.
[0023]
In this case, since the disc-shaped recording medium is held in the holding unit without being tilted, the rotating shaft moves in a direction perpendicular to the surface of the disc-shaped recording medium held, so that the disc-shaped recording caused by the tilt of the disc-shaped recording medium. It is possible to avoid a collision between the medium and the pickup unit.
[0024]
In the above configuration, the rotation holding unit may be moved by the moving unit in conjunction with an operation of a motor for loading / unloading the disc-shaped recording medium.
[0025]
In this case, the movement of the rotation holding unit by the moving means is performed in conjunction with the operation of the motor for loading / unloading the disc-shaped recording medium, so that the holding unit holds the disc-shaped recording medium only during loading / unloading. It becomes possible to move the disk-shaped recording medium in a direction away from the pickup unit.
[0026]
In the above-described configuration, the rotation holding unit may be moved in the direction approaching the disk-shaped recording medium by the moving means only when information is recorded / reproduced on the disk-shaped recording medium.
[0027]
In this case, only when recording / reproducing information on / from the disk-shaped recording medium, the rotation holding unit is moved by the moving means in a direction approaching the disk-shaped recording medium, so that the loaded disk-shaped recording medium is loaded. It is possible to reliably avoid a collision between the pickup unit and the disk-shaped recording medium during non-recording / reproduction with respect to the disk and when the apparatus is turned off.
[0028]
In the above configuration, the disk-shaped recording medium is stored in a cartridge, and the amount of movement of the rotation holding unit by the moving means may be set to be equal to or less than the gap width between the inner wall of the cartridge and the disk-shaped recording medium. Good.
[0029]
In this case, even when a cartridge storing a disk-shaped recording medium is used, the amount of movement of the rotation holding unit by the moving means is set to be equal to or less than the gap width between the inner wall of the cartridge and the disk-shaped recording medium. When loading the disc-shaped recording medium, when not recording / reproducing to / from the loaded disc-shaped recording medium, and when the power of the apparatus is turned off, the pickup unit and the disc-shaped disc are not in contact with the inner wall of the cartridge. It is possible to reliably avoid a collision with the recording medium.
[0030]
In the above-described configuration, when the disc-shaped recording medium held by the holding unit is moved in the direction in which the moving unit approaches the pickup unit, the rotating unit has a rotation speed set in advance until the movement is completed. It may be configured.
[0031]
In this case, the disc-shaped recording medium held by the holding unit by the moving unit can be brought close to the pickup unit while focusing the pickup unit, and the movement of the moving unit is limited so as to correspond to the focus of the pickup unit. It becomes possible to make it. As a result, it is possible to avoid a collision between the disc-shaped recording medium and the pickup unit.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. In each of the embodiments described below, an optical disc having a diameter of 120 mm and having a central hole is used as the disc-shaped recording medium, for example, as in a CD or DVD. However, this disc-shaped recording / reproducing medium is not limited to the method of recording / reproducing information, and the diameter thereof is also limited to 120 mm, if the shape is formed in a disc shape. is not.
<Embodiment 1>
An information recording / reproducing apparatus according to the first embodiment is shown in FIGS. 1 is a plan view of the information recording / reproducing apparatus 1, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
[0033]
As shown in FIGS. 1 and 2, the information recording / reproducing apparatus 1 includes a chassis 3 on a base 11 that is a part of a casing, and the optical disk 2 is irradiated with light on the chassis 3 to obtain information. Are provided with an optical pickup 4 that performs recording and reproduction, and a rotation holding unit 5 that holds and rotates the optical disc 2.
[0034]
As shown in FIGS. 3 and 4, the optical pickup 4 includes an objective lens 41 that condenses laser light when recording / reproducing information on the optical disc 2, and holds the objective lens 41 in the focusing direction and the tracking direction. The objective lens driving device 42 is driven so as to correct the path of the focused laser beam, and an optical block (not shown) that records and reproduces information based on the reflected light from the optical disc 2.
[0035]
In addition, a guide hole 43 is formed in the optical pickup 4, and a guide shaft 44 that guides the optical pickup 4 in the radial direction of the optical disk 2 held in the rotation holding unit 5 is inserted into the guide hole 43, The pickup 4 is scanned in the radial direction of the optical disc 2 held by the rotation holding unit 5 by the guide shaft 44.
[0036]
As shown in FIGS. 3 and 4, the rotation holding unit 5 is connected to the turntable 51 that holds the optical disc 2 and the turntable 51, and is rotationally driven by a motor drive circuit (not shown) and held on the turntable 51. And a spindle motor 52 for rotating the optical disk 2 formed.
[0037]
As shown in FIGS. 3 and 4, a chucking magnet 45 is provided inside the turntable 51, and a clamper 54 is provided above the chucking magnet 45. An inclined piece 55 for fitting the center hole 2a of the optical disc 2 is provided so as to be movable in a direction perpendicular to the surface of the optical disc 2 to be held (X direction, see FIGS. 3 and 4). The optical disk 2 is held on the turntable 51 when the clamper 54 is attracted to the chucking magnet 45, and the peripheral edge of the center hole 2a of the optical disk 2 is fitted into the inclined piece 55 so that the information recording / reproducing apparatus 1 The optical disk 2 is positioned.
[0038]
The outer periphery of the spindle motor 52 is constituted by a rotor case 57 in which a rotor magnet 56 for motor magnetic circuit (hereinafter referred to as a rotor magnet) is fixed to the inner surface of the outer periphery by press-fitting or the like. 58 is provided. The shaft 58 has a hemispherical tip 58a in the axial direction (X direction, see FIGS. 3 and 4).
[0039]
A metal bearing 59 is provided on the outer peripheral side of the shaft 58 with a gap of about several μm, and the tip 58 a of the shaft 58 is connected to the stator plate 511 which is the casing surface of the rotation holding unit 5 via the thrust plate 510. It touches the plate surface. This contact is caused when the rotor magnet 56 and the core 512 described below are attracted, and the axial position (X direction) of the shaft 58 of the rotor magnet 56 and the axial direction (X direction) of the shaft 58 of the core 512. This occurs because the rotor center 57 is sucked downward in the axial direction (X direction).
[0040]
Further, a bearing holder 513 is provided above the stator plate 511 and on the outer peripheral side of the metal bearing 59, and on the outer peripheral side of the bearing holder 513, the drive coil 514 is arranged in the axial direction (X direction) of the shaft 58. A core 512 wound around is provided.
[0041]
Further, in this information recording / reproducing apparatus 1, when the optical disk 2 is held on the turntable 51, the rotation holding unit 5 provided with the turntable 51 and the optical pickup 4 are moved in a direction perpendicular to the surface of the optical disk 2. A moving means 6 is provided.
[0042]
The moving means 6 moves the chassis 3 in a direction perpendicular to the surface of the optical disk 2 in conjunction with the driving of the motor 61 and the motor 61 for loading / unloading the optical disk 2 described above. A slide plate 63 that guides the chassis 3 and a lift lever 64 that moves the rotation holding unit 5 in a direction perpendicular to the surface of the optical disc 2 in conjunction with the vertical movement of the chassis 3 by the slide plate 63. Has been.
[0043]
The chassis 3 is provided on the base 11 via a leaf spring 65 that is movable in a direction perpendicular to the surface of the optical disk 2 held by the rotation holding unit 5 at one end thereof.
[0044]
The motor 61 is provided with a relay gear 62 that slides a rack portion 63c of a slide plate 63, which will be described later, in accordance with the rotation that occurs when loading / unloading.
[0045]
The slide plate 63 has two operation pins 63a that guide the chassis 3 to move in a direction perpendicular to the surface of the optical disc 2 and two drive pins 3a provided at the other end of the chassis 3 are engaged. The cam portion 63b has a shape and a rack portion 63c engaged with a relay gear 62 of a motor 61 that is driven when loading / unloading.
[0046]
The raising / lowering lever 64 is provided in the state which can be rotated to the fulcrum on the chassis 3, and the one end part is divided into two forks. Each end 64a of the one end is provided with a low friction member 64b, and each end 64a enters a space below the rotor case 57 (see FIGS. 3 and 4) so as to be engageable with the rotor case 57. Has been. The other end of the lift lever 64 is disposed at a position where it can engage with the operation portion 63 a of the slide plate 63.
[0047]
A fulcrum on the chassis 3 is provided with a torsion spring 64c. One end of the torsion spring 64c is hung on the lift lever 64, and the other end is hung on the chassis 3. The lift lever 64 is urged counterclockwise by the torsion spring 64c. By this urging, each tip 64 a at one end of the elevating lever 64 raises the rotor case 57.
[0048]
Next, the loading / unloading process of the optical disc 2 in the information recording / reproducing apparatus 1 will be described with reference to FIGS.
[0049]
When the optical disk 2 is not loaded onto the information recording / reproducing apparatus 1, the slide plate 63 is arranged in the state shown in FIGS. 5 and 6 so that the optical disk 2 can be loaded. Further, the drive pin 3a of the chassis 3 is guided to the lowermost part by being guided by the cam portion 63b of the slide plate 63, and the chassis 3 is inclined with respect to the base 11 as shown in FIG. . At this time, the elevating lever 64 is urged counterclockwise by the torsion spring 64c (see FIG. 4), one end thereof is raised, and one end of the ascending elevating lever 64 pushes up the rotor case 57. . As a result, the rotor case 57 rises in a direction away from the chassis 3 (X direction, see FIG. 4). In the spindle motor 52, the rotor case 57 is attracted in the direction of the stator plate 511 by the attractive force of the rotor magnet 56 and the drive coil 514 as shown in FIG. 4.
[0050]
In the state of the information recording / reproducing apparatus 1, the optical disk 2 is loaded by a disk transport mechanism (not shown). Then, in order to load the optical disc 2, the motor 61 starts to rotate in the clockwise direction, and the rack portion 63 c of the slide plate 63 slides in the Y direction via the relay gear 62 in conjunction with the motor 61. At the same time (see FIG. 5), the drive pin 3a of the chassis 3 is guided by the cam portion 63b of the slide plate 63 and rises in the Z direction (see FIG. 6). At this time, as shown in FIG. 2, the optical disc 2 is held between the clamper 54 and the center thereof on the turntable 51 of the spindle motor 52 (see FIG. 4).
[0051]
As the motor 61 continues to rotate, the slide plate 63 performs a slide operation. By this sliding operation, the drive pin 3a of the chassis 3 engaged with the cam portion 63b rises to a height at which the operation portion 63a of the slide plate 63 in the information recording / reproducing apparatus 1 is provided (FIGS. 1 and 2). ,reference). When the drive pin 3a of the chassis 3 rises to a height at which the operation portion 63a of the slide plate 63 is provided, the operation portion 63a of the slide plate 63 enters the lower part of the other end portion of the elevating lever 64. At this time, the elevating lever 64 rotates in the clockwise direction against the urging force of the torsion spring 64c (see FIGS. 7 and 8). As shown in FIG. 4, one end 64a of the elevating lever 64 is a rotor. The rotor case 57 is attracted downward by the attractive force of the rotor magnet 56 and the drive coil 514, and the tip spherical surface 58a of the shaft 58 is lowered to a position where it abuts against the thrust plate 510. Thus, the distance between the optical disk 1 and the objective lens 6 becomes a predetermined distance (see FIG. 3), and the loading of the optical disk 2 in the information recording / reproducing apparatus 1 is finished.
[0052]
Further, unloading of the optical disc 2 in the information recording / reproducing apparatus 1 is performed by a process reverse to the loading process of the optical disc 2 described above. Therefore, the description of the unloading process of the optical disc 2 is omitted.
[0053]
As described above, according to the information recording / reproducing apparatus 1, since the rotation holding unit 5, the optical pickup 4, and the moving means 6 are provided, information is read from the optical disc 2 held on the turntable 51 by the optical pickup 4. Except when recording / reproducing, the distance between the surface of the optical disc 2 held on the turntable 51 and the objective lens 41 can be separated by the moving means 6, and as a result, the optical pickup 4 and the optical disc 2 held on the turntable 51 can be separated from each other. Collisions can be avoided. In particular, the effect is remarkable in a high-density information recording / reproducing apparatus having a small working distance (working distance) between the optical disc 2 and the objective lens 41.
[0054]
Further, since the moving means 6 is in contact with the spindle motor 52 at a plurality of locations thereof, it is perpendicular to the surface of the optical disc 2 (X direction, see FIGS. 3 and 4) as compared with the case of contact at a single point. ) Can move without tilting. Further, compared to the case where the rotation holding unit 5 is moved in the vertical direction at one point, it is possible to prevent wear caused by sliding between the shaft 58 of the spindle motor 52 and the thrust plate 510 due to vertical movement.
[0055]
Further, when the thrust plate 510 and the shaft 58 are simultaneously vertically moved (lifted / lowered) via the thrust plate 510 of the spindle motor 52, the optical disc 2 is moved in a direction approaching the optical pickup 4 (downward in the X direction, FIG. 3). 4), the spindle motor 52 can be rotated, the optical disc 2 can be brought closer to the optical pickup while the optical pickup 4 is focused, and the collision between the optical disc 2 and the objective lens 41 is further prevented. can do.
[0056]
Further, when the information recording / reproduction is enabled, the moving means 6 and the spindle motor 52 are not in contact with each other, so that the spindle motor 52 can be turned without being affected by the load caused by the contact with the moving means 6. The optical disk 2 held on the table 51 can be rotated.
[0057]
Further, since the optical disk 2 is held on the turntable 51 without being tilted, the shaft 58 moves in a direction perpendicular to the surface of the optical disk 2 held by the shaft 58, so that the optical disk 2 collides with the optical pickup 4 due to the tilt of the optical disk 2. Can be avoided.
[0058]
Further, since the movement of the moving means 6 is performed in conjunction with the operation of the motor 61 for loading / unloading the optical disk 2, the motor rotor (not shown) is raised only during loading / unloading of the optical disk 2 to turn the turntable. The optical disk 2 held by the head 51 can be moved away from the optical pickup 4.
[0059]
In the first embodiment, the operation unit 63a is provided on the slide plate 63 and the lift lever 64 is operated in conjunction with the operation of the motor 61. However, the present invention is not limited to this, and the lift lever 64 is operated. A dedicated drive source such as a motor may be provided.
[0060]
In the first embodiment, the single optical disk 2 is used as the optical disk 2. However, the present invention is not limited to this, and the optical disk 2 stored in a cartridge may be used. In the information recording / reproducing apparatus 1 according to the first embodiment, the moving amount of the moving means can be arbitrarily set (for example, set to be equal to or smaller than the gap width between the inner wall of the cartridge and the optical disk 2). Even when the cartridge is used, the optical disk 2 is placed on the inner wall of the cartridge when the optical disk 2 is loaded, when the information recording / reproducing apparatus 1 is turned off, and when the information recording / reproducing apparatus 1 is turned off. It is possible to reliably avoid the collision between the optical pickup 4 and the optical disc 2 in a state where no hit occurs.
[0061]
Further, the sliding operation of the slide plate 63 (see FIGS. 1, 2, 5, 6, 7, and 8) may be linked to a switch (not shown) for recording / reproducing information on the optical disc 2. In this case, as shown in FIG. 8, during recording / reproduction, the optical disk 2 is moved closer to the objective lens 41 by lowering the motor rotor, and the optical disk 2 is moved away from the objective lens 41 by raising the motor rotor in other states. That is, the rotation holding unit 5 is lowered by the moving means 6 only when information is recorded on and reproduced from the optical disk 2, so that the apparatus is turned off when the optical disk 2 is loaded, when it is not recorded and reproduced on the loaded optical disk 2, and when the apparatus is turned off. Thus, the collision between the optical pickup 4 and the optical disk 2 can be avoided reliably.
[0062]
In the first embodiment, the optical disk 2 is held by the rotation holding unit 5, and the optical disk 2 is rotated by the spindle motor 52 after the optical disk 2 is brought close to the objective lens 41 by lowering the motor rotor. However, the present invention is not limited to this, and when the rotation holding unit 5 is moved by the moving means 6 in a direction approaching the optical disk 2 to be held, the spindle motor 52 has a rotation speed set in advance until the movement is completed. It may be configured as follows. In this case, since the low friction member 64 b (see FIGS. 3 and 4) is provided at one end 64 a of the elevating lever 64, the optical disk 2 held on the turntable 51 by the moving means 6 while focusing the optical pickup 4. Can be moved closer to the optical pickup 4 and the movement of the moving means 6 can be restricted so as to correspond to the coincidence of the focus of the optical pickup 4. As a result, a collision between the optical disc 2 and the optical pickup 4 can be avoided. A similar effect can be obtained by providing a rotating roller or the like instead of the low friction member 64b.
[0063]
Next, another information recording / reproducing apparatus having the same effect as the information recording / reproducing apparatus 1 according to the first embodiment will be described.
<Embodiment 2>
The information recording / reproducing apparatus 1 according to the second embodiment is the same as the information recording / reproducing apparatus 1 according to the first embodiment except that the rotation holding unit 5 and the elevating lever 64 are different. Therefore, only the configuration different from the information recording / reproducing apparatus 1 according to the first embodiment will be described in detail here, and the detailed description of the same configuration will be omitted.
[0064]
In the information recording / reproducing apparatus 1, a chassis 3 is disposed on a base 11, and an optical pickup 4 and a rotation holding unit 5 are provided on the chassis 3.
[0065]
As shown in FIGS. 9 and 10, the rotation holding unit 5 includes a turntable 51 and a spindle motor 52.
[0066]
As shown in FIGS. 9 and 10, the turntable 51 is provided with a chucking magnet 45 inside, and a clamper 54 is provided above the chucking magnet 45. An inclined piece 55 for fitting the center hole 2a of the optical disc 2 is provided.
[0067]
The outer periphery of the spindle motor 52 is constituted by a rotor case 57 in which a rotor magnet 56 is fixed to the inner surface of the outer periphery by press fitting or the like, and a shaft 58 is provided at the center of the rotor case 57. The shaft 58 has an axial direction (X ′ direction, see FIGS. 9 and 10), and a lower end 58a thereof is formed in a hemispherical shape.
[0068]
A metal bearing 59 is provided on the outer peripheral side of the shaft 58 with a gap of about several μm, and the tip 58 a of the shaft 58 is in contact with the plate surface of the thrust plate holding portion 515 via the thrust plate 510.
[0069]
Further, a bearing holder 513 is provided above the stator plate 511 and on the outer peripheral side of the metal bearing 59, and on the outer peripheral side of the bearing holder 513, a drive coil is arranged in the axial direction of the shaft 58 (X ′ direction). A core 512 around which 514 is wound is provided. Further, a moving area D in which the thrust plate holding portion 515 can move in the axial direction (X ′ direction) of the shaft 58 is formed at a position where the thrust plate holding portion 515 of the bearing holder 513 is disposed.
[0070]
Further, in this information recording / reproducing apparatus 1, when the optical disk 2 is held on the turntable 51, the rotation holding unit 5 provided with the turntable 51 and the optical pickup 4 are moved in a direction perpendicular to the surface of the optical disk 2. A moving means 6 is provided.
[0071]
The moving means 6 moves the chassis 3 in a direction perpendicular to the surface of the optical disk 2 in conjunction with the driving of the motor 61 and the motor 61 for loading / unloading the optical disk 2 described above. The slide plate 63 that guides the chassis 3 and an elevating lever 64 that moves the rotation holding unit 5 in the vertical direction relative to the surface of the optical disc 2 in conjunction with the vertical movement of the chassis 3 by the slide plate 63. ing.
[0072]
The elevating lever 64 is provided at a fulcrum on the chassis 3 in a rotatable state. A tip 64 a at one end of the lift lever 64 is formed into a spherical body, and the tip 64 a is in contact with the bottom surface of a thrust plate holding member 515 provided at the center of the stator plate 511. The other end of the lift lever 64 is a piece that engages with the operation portion 63 a of the slide plate 63.
[0073]
A fulcrum on the chassis 3 is provided with a torsion spring 64c. One end of the torsion spring 64c is hung on the lift lever 64, and the other end is hung on the chassis 3. The lift lever 64 is urged counterclockwise by the torsion spring 64c. Due to this urging, each tip 64 a at one end of the elevating lever 64 raises the thrust plate holding portion 515.
[0074]
Next, the loading / unloading process of the optical disc 2 in the information recording / reproducing apparatus 1 will be described with reference to FIGS. 1, 2, 5, 6, 6, 7, 8, 9 and 10. FIG.
[0075]
When the optical disk 2 is not loaded onto the information recording / reproducing apparatus 1, the slide plate 63 is arranged in the state shown in FIGS. 5 and 6 so that the optical disk 2 can be loaded. Further, the drive pin 3a of the chassis 3 is guided to the lowermost part by being guided by the cam portion 63b of the slide plate 63, and the chassis 3 is inclined with respect to the base 11 as shown in FIG. . At this time, the elevating lever 64 is urged counterclockwise by a torsion spring 64c (see FIG. 9), one end side thereof is raised, and one end of the elevating lever 64 that is raised moves the thrust plate holding portion 515. Push up. As a result, the thrust plate holding portion 515 is raised in the direction away from the chassis 3 (X ′ direction, see FIG. 9). In the spindle motor 52, as shown in FIG. 9, the rotor case 57 is attracted in the direction of the stator plate 511 by the attractive force of the rotor magnet 56 and the drive coil 514.
[0076]
In the state of the information recording / reproducing apparatus 1, the optical disk 2 is loaded by a disk transport mechanism (not shown). Then, in order to load the optical disc 2, the motor 61 starts to rotate in the clockwise direction, and the rack portion 63 c of the slide plate 63 slides in the Y direction via the relay gear 62 in conjunction with the motor 61. At the same time, the drive pin 3a of the chassis 3 is guided by the cam portion 63b of the slide plate 63 and moves up in the Y direction (see FIG. 5). At this time, as shown in FIGS. 1 and 2, the optical disk 2 is held between the clamper 54 while being centered on the turntable 51 of the spindle motor 52.
[0077]
As the motor 61 continues to rotate, the slide plate 63 performs a slide operation. By this sliding operation, the drive pin 3a of the chassis 3 engaged with the cam portion 63b rises to a height at which the operation portion 63a of the slide plate 63 in the information recording / reproducing apparatus 1 is provided (FIGS. 1 and 2). ,reference). When the drive pin 3a of the chassis 3 rises to a height at which the operation portion 63a of the slide plate 63 is provided, the operation portion 63a of the slide plate 63 enters the lower part of the other end portion of the elevating lever 64. At this time, the elevating lever 64 rotates in the clockwise direction against the biasing force of the torsion spring 64c (see FIGS. 7 and 8), and as shown in FIG. 9, the rotor magnet 56 and the drive coil 514 The rotor case 57 is sucked downward by the suction force, and the tip spherical surface 58a of the shaft 58 is lowered while being in contact with the thrust plate holding portion 515 via the thrust plate holding portion 510, thereby the optical disc 1 and the objective. The distance from the lens 6 is a predetermined distance (see FIG. 10), and the loading of the optical disc 2 in the information recording / reproducing apparatus 1 is completed.
[0078]
Further, unloading of the optical disc 2 in the information recording / reproducing apparatus 1 is performed by a process reverse to the loading process of the optical disc 2 described above. Therefore, the description of the unloading process of the optical disc 2 is omitted.
[0079]
【The invention's effect】
As described above, according to the present invention, the objective can be obtained even when the disc-shaped recording medium is loaded, during non-recording / reproducing with respect to the loaded disc-shaped recording medium, and when the apparatus is turned off. It is possible to provide an information recording / reproducing apparatus having a small and simple configuration that reliably avoids a collision between a lens and a disk-shaped recording medium.
[0080]
That is, the information recording / reproducing apparatus according to the present invention includes a rotation holding unit, a pickup unit, and a moving unit. When the information recording / reproducing is enabled, the moving unit and the rotating unit are in a non-contact state. Therefore, the distance between the surface of the disc-shaped recording medium held on the holding unit by the moving means and the objective lens can be increased except when information is recorded and reproduced from the disc-shaped recording medium held on the holding unit by the pickup unit. . As a result, it is possible to avoid a collision between the pickup unit and the disc-shaped recording medium held by the holding unit. In particular, the effect is remarkable in a high-density information recording / reproducing apparatus having a small working distance (working distance) between the disc-shaped recording medium and the objective lens. Further, according to the present invention, it is possible to rotate the disc-shaped recording medium held by the holding unit without being affected by the load caused by the contact with the moving means.
[Brief description of the drawings]
FIG. 1 is a plan view of an information recording / reproducing apparatus according to a first embodiment when a chassis is raised.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a side sectional view of a spindle motor provided in the information recording / reproducing apparatus according to the first embodiment;
FIG. 4 is a side cross-sectional view of the spindle motor provided in the information recording / reproducing apparatus according to the first embodiment at a position where a rotor portion is raised.
FIG. 5 is a plan view of the information recording / reproducing apparatus according to the first embodiment when the optical disc is not inserted into the information recording / reproducing apparatus.
6 is a cross-sectional view taken along line BB in FIG.
FIG. 7 is a plan view of the information recording / reproducing apparatus according to the first embodiment when the optical disk is chucked on the turntable and the motor rotor is lowered.
8 is a cross-sectional view taken along line CC in FIG.
FIG. 9 is a side cross-sectional view at a position where a rotor portion of a spindle motor provided in the information recording / reproducing apparatus according to the second embodiment is raised;
FIG. 10 is a side sectional view of a spindle motor provided in the information recording / reproducing apparatus according to the second embodiment.
FIG. 11 is a schematic side view of a conventional information recording / reproducing apparatus in a state where an optical disk loaded on an optical pickup is in contact with the optical pickup.
[Explanation of symbols]
1 Information recording and playback device
11 base
2 Optical disc
2a Center hole
3 Chassis
3a Drive pin
4 Optical pickup
41 Objective lens
42 Objective lens driving device
43 Guide hole
44 Guide shaft
45 Chucking Magnet
5 Rotation holding part
51 turntable
52 Spindle motor
54 Clamper
55 Tilting piece
56 Rotor Magnet for Motor Magnetic Circuit
57 Rotor case
58 shaft
58a Shaft tip
59 Metal bearing
510 Thrust board
511 Stator plate
513 Bearing holder
512 core
514 Drive coil
515 Thrust plate holding member
6 Moving means
61 motor
62 Relay gear
63 Slide plate
63a Operation unit
63b Cam part
63c Rack part
64 Lifting lever
64a Tip of lift lever
64b Low friction member
64c torsion spring
65 leaf spring

Claims (8)

A rotary holding unit configured to hold a disc-shaped recording medium for recording and reproducing information, a rotating unit for rotating the disc-shaped recording medium held in the holding unit, and a disc-shaped recording held in the holding unit In an information recording / reproducing apparatus in which a pickup unit for recording / reproducing information on a medium is provided in a chassis,
Moving means for moving the rotation holding unit in a direction perpendicular to the surface of the disc-shaped recording medium held by the holding unit is provided, and the surface of the disc-shaped recording medium held by the holding unit by this movement Adjust the distance to the pickup unit,
When the disc-shaped recording medium held in the holding unit by the moving unit is brought close to the pickup unit and information can be recorded and reproduced, the moving unit and the rotating unit are in a non-contact state. A characteristic information recording / reproducing apparatus.   The moving means moves in a direction perpendicular to the surface of the disc-shaped recording medium held by the holding unit by contacting the rotating unit at a plurality of locations thereof. 2. The information recording / reproducing apparatus according to 1. The rotating portion is provided with a bearing plate that directly contacts the moving means, and a rod-shaped rotating shaft extending in the vertical direction with a tip formed in a hemispherical shape,
The rotation means is moved in a direction perpendicular to the surface of the disc-shaped recording medium held by the holding portion by moving the rotation shaft while the tip of the rotating shaft is in contact with the bearing plate. The information recording / reproducing apparatus according to claim 1, wherein:   After the disc-shaped recording medium is held by the holding unit, the rotation holding unit is moved by the moving unit in a direction perpendicular to the surface of the disc-shaped recording medium held by the holding unit. The information recording / reproducing apparatus according to claim 1.   2. The information recording / reproducing apparatus according to claim 1, wherein the rotation holding unit is moved by the moving unit in conjunction with operation of a motor for loading / unloading the disk-shaped recording medium.   2. The information recording / reproducing apparatus according to claim 1, wherein the rotation holding unit is moved in a direction approaching the disk-shaped recording medium by the moving unit only when information is recorded / reproduced on the disk-shaped recording medium. The disc-shaped recording medium is stored in a cartridge,
The information recording / reproducing apparatus according to claim 1, wherein an amount of movement of the rotation holding unit by the moving unit is set to be equal to or less than a gap width between an inner wall of the cartridge and the disc-shaped recording medium.   When moving the disc-shaped recording medium held by the holding unit in the direction of approaching the pickup unit by the moving unit, the rotating unit is configured to have a preset number of rotations until the movement is completed. The information recording / reproducing apparatus according to claim 1.

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