JP2004327010A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an objective lens from colliding with an optical disk even when receiving strong disturbance without bringing the optical disk into contact with the objective lens at all even when the power is turned off and servo control is not operating. <P>SOLUTION: A cartridge 2 has an opening part through which the objective lens 4 comes close to the optical disk 1 and a rib 2b formed near a cartridge outer-edge connection part of the opening part. The plane of the rib 2b on the side of the objective lens 4 is substantially on the same plane with the plane of incidence of the optical disk 1. When the optical disk device 100 is turned off, a traverse mechanism 22 moves the objective lens 4 and a protective ring 5 to a position P2 facing the plane of the rib 2b on the side of the objective lens 4 when the cartridge 2 is housed in the optical disk device 100. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disk device for preventing mutual damage due to a collision between an optical disk and an objective lens when a power supply of the device is stopped.

  With the recent demand for higher density of optical discs, optical heads used for recording / reproducing have been shortening the wavelength of laser light and increasing the NA (numerical aperture) of objective lenses. However, an objective lens system having a large NA generally approaches the optical disk, and has a configuration in which a so-called working distance (hereinafter, abbreviated as WD) is small. Furthermore, in order to reduce the size of the entire apparatus, the diameter of the luminous flux incident on the objective lens tends to decrease, and as a result, the WD tends to decrease. In some cases, the value of WD has reached about 0.1 mm.

  The problem in such a small WD is that a collision between the objective lens and the optical disk is fundamentally unavoidable. That is, when the WD is smaller than the normal surface runout of the optical disc, and the servo control is not performed, the contact between the objective lens and the optical disc occurs many times in a short time only by rotating the optical disc. Therefore, there is a possibility that large scratches and dents may occur instantaneously. As a result, the optical characteristics are degraded, which may cause a problem in recording / reproducing.

  For example, Patent Literature 1 discloses a countermeasure against such a problem. In this example, a projection facing the recording medium (optical disk) side is integrally formed on the outer peripheral portion of the objective lens to protect the objective lens. Further, for example, Patent Document 2 discloses a similar example.

  The point is that a portion protruding from the objective lens is provided near the objective lens to avoid direct collision between the optical disc and the objective lens.

  FIG. 10 shows the main part. FIG. 10 is a diagram showing an example of the arrangement of a conventional optical disk and an objective lens. In FIG. 10, 1 is an optical disk, and 4 is an objective lens. An annular protection ring 5 is provided around the objective lens 4, and the tip of the protection ring 5 is formed higher than the top of the objective lens 4. That is, the objective lens 4 is formed so as not to protrude from the protection ring 5.

With this configuration, the objective lens 4 does not come into direct contact with the optical disc 1. Therefore, the objective lens 4 is not damaged. Further, by appropriately selecting the material and surface treatment of the protection ring 5, the possibility of damaging the optical disk 1 can be reduced.
JP-A-9-63095 JP-A-6-302001

  However, the above-described conventional optical disk device has the following problems. That is, when the power is on, the collision can be avoided by the servo control. However, if the power is off and the optical disk remains inserted in the apparatus, the servo control is not performed and the protection ring 5 It may remain in contact with the optical disc 1.

  For example, the focusing mechanism of an objective lens actuator is usually not balanced against gravity. Therefore, when the optical disk device is a portable device, the objective lens 4 is displaced in the direction of gravity G by its own weight only by turning over as shown in FIG. If the storage state is maintained for a long time and dew condensation or the like occurs, the optical disc 1 may be left with stains of dew condensation traces due to impurities or the like.

  Further, particularly in a portable optical disk device, if the power is turned off while the disk is also inserted, the objective lens 4 loses the means to oppose the disturbance, the objective lens 4 freely vibrates, and the protection ring 5 Collides with the disk 1 many times.

  In portable equipment, it is normal use to turn off the power while the media is loaded and transport with vibrations. In this case, it depends on the natural resonance frequency of the objective lens actuator etc. When transported, hundreds of thousands of collisions can occur at the same location on the optical disc. Therefore, the damage of the optical disk due to it can not be ignored.

  Deterioration of the optical characteristics of the optical disk due to the dew condensation trace due to such a conventional collision countermeasure and the damage due to the power-off vibration collision state has conventionally been a major problem.

  The present invention has been made in order to solve the above-described problem, and the optical disk and the objective lens never contact even in a state where the power is off and the servo control is not applied, and the optical disk can be used even when subjected to strong disturbance. It is an object of the present invention to provide an optical disk device capable of preventing a collision between the optical disk and an objective lens.

  An optical disc device according to the present invention includes an objective lens for converging and irradiating a laser beam on an optical disc, a protection member protruding from the objective lens toward the optical disc and provided outside an optically effective area of the objective lens to protect the objective lens, An optical disc device having at least a traverse mechanism for moving a lens and a protection member, wherein a rib provided outside the outer circumference of the optical disc and having a surface on the objective lens side substantially flush with the incident surface of the optical disc is provided. The traverse mechanism moves the objective lens and the protection member to a position facing the surface of the rib on the objective lens side when the optical disk device is in a power-off state.

  According to this configuration, the optical disk is never in contact with the objective lens even when the power is off and the servo control is not applied, and the optical disk is not damaged even under a strong disturbance. In addition, it is possible to provide an excellent optical disk device in which the long-term reliability of recorded data is easily improved. In addition, even when the power is off and the optical disk remains inserted in the apparatus, the optical disk does not come into contact with the protective member, so that the optical disk and the protective member come into contact with each other for a long time. Of the optical disk can be prevented.

  In the above optical disk apparatus, it is preferable that the optical disk is built in the cartridge, and the rib is provided near an outer edge connecting portion of the opening for the objective lens to approach the optical disk.

  According to this configuration, by using the vicinity of the outer edge connection portion of the opening of the cartridge in which the optical disc is built as a rib, it is not necessary to provide a special rib, and the number of steps for providing the rib can be reduced.

  In the above optical disk device, the rib is preferably provided on a main body of the optical disk device. According to this configuration, even when the optical disk 1 is not built in the cartridge, the power is off, and the servo control is not applied, the optical disk 1 and the objective lens 4 never come into contact with each other, and even if a strong disturbance is received. It is possible to provide an excellent optical disk device 102 that does not damage the optical disk 1 and that can easily and easily improve the long-term reliability of recorded data at low cost.

  Further, in the above optical disk device, it is preferable that the traverse mechanism moves the objective lens to a position facing the rib after the power-off request and before the power-off state. According to this configuration, the objective lens can be arranged below the rib before the servo control is not applied, and the objective lens and the optical disk can be reliably protected.

  In the above optical disk device, it is preferable that the optical disk device further includes a focusing mechanism for moving the objective lens in a direction away from the optical disk before reaching the position where the objective lens faces the rib beyond the optical disk. According to this configuration, it is possible to avoid collision between the side surface of the objective lens and the side surface of the rib, and it is possible to reliably avoid damage to an actuator or the like that drives the objective lens.

  Further, in the above optical disc apparatus, after the power-on request from the power-off state, the objective lens is moved in a direction away from the optical disc before the objective lens is moved in a radial direction of the optical disc from a position facing the rib. It is preferable to further include a focusing mechanism.

  According to this configuration, it is possible to avoid sliding between the objective lens and the rib and collision between the side surface of the objective lens and the side surface of the optical disk, and to reliably avoid damage to an actuator or the like that drives the objective lens. Can be.

  Further, in the above optical disk device, the traverse mechanism moves the optical system including the objective lens in a substantially radial direction with respect to the optical disk, receives at least a power-on request signal and a power-off request signal, and turns off the power. The optical disc drive further includes a control unit that outputs an off signal, an objective lens retreat signal for moving the objective lens away from the optical disc, and a traverse control signal for controlling a traverse mechanism. When the request signal is received, the objective lens retreat signal is turned on to move the objective lens away from the optical disc, and then a traverse control signal for moving the objective lens to the outer peripheral side of the optical disc is output to the traverse mechanism, and the objective lens is moved to the rib. Turn the objective lens retraction signal off after placing it at the opposite position, and turn off the power. When the power is turned off, the optical disk device is turned off. When the optical disk device receives a power-on request signal in the power-off state, the objective lens retreat signal is turned on to separate the objective lens from the rib, and then the objective lens is placed inside the optical disk. It is preferable to output a traverse control signal for moving in the circumferential direction to the traverse mechanism, move the objective lens toward the inner circumference of the optical disc, and then turn off the objective lens retracting signal.

  According to this configuration, the control unit controls the retreat signal for retreating the objective lens from the optical disc or the rib according to the power supply state of the optical disc apparatus before and after the movement of the traverse mechanism, so that it can be safely and automatically performed from any state. Thus, the objective lens and the optical disk can be protected.

  Further, in the above optical disk device, the control unit receives at least an operation state signal indicating whether or not information is being recorded as one of the inputs, and supplies a power-off request while the operation state signal indicates the information recording state. When receiving the signal, it is preferable to wait until the operation state signal changes to a state other than the information recording state before turning on the objective lens retreat signal. According to this configuration, the evacuation of the objective lens is performed after the information is securely recorded, so that the convenience of the user can be improved and the reliability of the information can be improved.

  In the above optical disk device, it is preferable that the objective lens and the protection member are formed integrally. According to this configuration, since the objective lens and the protection member are integrally formed, the objective lens and the protection member can be formed by one molding, and the number of manufacturing steps can be reduced. Further, since the objective lens and the protection member are formed integrally, it is possible to prevent the protection member from falling off from the objective lens.

  According to the present invention, even when the power is off and the servo control is not applied, the optical disc and the objective lens never come into contact with each other, and the optical disc is not damaged even under a strong disturbance. In addition, it is possible to provide an excellent optical disk device in which the long-term reliability of recorded data is easily improved. In addition, even when the power is off and the optical disk remains inserted in the apparatus, the optical disk does not come into contact with the protective member, so that the optical disk and the protective member come into contact with each other for a long time. Of the optical disk can be prevented.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 3 show an optical disk device according to an embodiment of the present invention.

  1A and 1B are views showing an example of a cartridge containing an optical disk. FIG. 1A is a cross-sectional view of the cartridge shown in FIG. 1B along the line AA, and FIG. FIG. 2 is a view of the cartridge shown in FIG. In FIGS. 1A and 1B, reference numeral 1 denotes an optical disk, which is the same as the conventional technology. Reference numeral 2 denotes a cartridge in which the optical disk 1 is built. The cartridge 2 is provided with an opening 2a for an optical head including an objective lens to access the optical disk 1, and has a rib 2b at an outer peripheral end. As shown in FIG. 1A, the surface of the rib 2b on the objective lens 4 side is set to be substantially flush with the surface 1b (light incident surface) of the optical disk 1 on the objective lens access side during operation. ing.

  FIG. 2 is a view of the cartridge 2 shown in FIG. The objective lens 4 and a protective ring (protective member) 5 provided on the side of the objective lens 4 and whose upper surface is located above the objective lens are the same as those in the related art. The objective lens 4 irradiates the optical disc 1 with laser light in a convergent manner. The protection ring 5 is provided outside the optically effective area of the objective lens 4, protrudes from the objective lens 4 toward the optical disc 1, and protects the objective lens 4. A portion of the protection ring 5 protruding from the objective lens 4 toward the optical disk 1 is formed in a concentric annular shape along the outer periphery of the objective lens 4. The protection ring 5 is preferably formed of a slidable resin material or the like.

  The shape of the portion of the protection ring 5 protruding from the objective lens 4 toward the optical disk 1 is not limited to the above. For example, a plurality of hemispherical convex portions may be formed along the outer periphery of the objective lens 4 from the objective lens 4. May also be formed in a shape protruding toward the optical disc 1, provided outside the optically effective area of the objective lens 4, protruding further toward the optical disc 1 than the objective lens 4, and capable of protecting the objective lens 4. Should be fine.

  Reference numeral 3 denotes an optical head on which an objective lens 4 is mounted. In the vicinity of the objective lens 4, an objective lens actuator unit (which drives the objective lens 4 slightly in the direction perpendicular to the surface of the optical disc 1 and in the radial direction to follow the surface deflection and eccentricity of the optical disc 1 to perform a focusing operation and a tracking operation ( Focusing mechanism) 3a is disposed.

  The objective lens 4, the protection ring 5, and the objective lens actuator 3a are sized to fit into the opening 2a as shown in the figure, thereby improving the space factor of the optical head 3.

  The cartridge 2 having such features is disclosed in, for example, JP-A-5-189917 as a means for eliminating the need for upper and lower cartridges during loading, and does not impair generality or practicality. .

  FIG. 3 is a diagram showing a configuration of the optical disc device according to Embodiment 1 of the present invention. The optical disc device 100 according to the first embodiment shown in FIG. 3 includes an objective lens 4, a protection ring 5, a control unit 9, a traverse drive circuit 21, and a traverse mechanism 22.

  The objective lens 4 can be accessed beyond the outer circumference of the optical disc 1 by the traverse mechanism 22, and can be moved to a position P2 which is a position facing the illustrated rib 2b.

  The traverse mechanism 22 is a mechanism for moving the optical head 3 in the radial direction of the optical disc 1 by a known screw feed mechanism so that a desired track can be accessed, and at least until the objective lens 4 comes below the rib 2b. That is, the optical head 3 can be moved in the outer peripheral direction to the position P2 shown in the figure. The traverse mechanism 22 includes a traverse motor 22a and a feed screw 22b. The traverse motor 22a is mounted on the traverse mechanism 22, and rotates the feed screw 22b. The traverse drive circuit 21 drives a traverse motor 22a.

  The control unit 9 receives a power-on request signal 11 and a power-off request signal 12 as inputs and outputs a power-off signal 16 and a traverse control signal 18.

  The power-on request signal 11 may be a user's switch input, an input from a program timer, or the like. The power-off request signal 12 may be input from a timer or a controller for power saving in addition to a user's switch input.

  The power-off signal 16 is output to a power-off circuit (for example, a power control IC). When the power-off signal 16 is turned on, the optical disk apparatus 100 shuts down at least separately from standby power. The traverse control signal 18 is output to the traverse drive circuit 21. When the traverse control signal 18 is output, the traverse drive circuit 21 moves the optical head 3 including the objective lens 4 to a target position in the radial direction of the optical disk. The traverse drive circuit 21 supplies a drive current such as an inward movement, an outward movement, and a stop to the traverse motor 22a in response to the traverse control signal 18.

  The operation of the optical disk device 100 according to the first embodiment configured as described above will be described below.

  First, the operation of the optical disk device 100 when the optical head 3 is at the position P1 in the power-on state will be described. When the power-off request signal 12 becomes active, the control unit 9 generates a signal for sending the optical head 3 to the outer peripheral side, for example, to the position P2, as the traverse control signal 18. In response to the traverse control signal 18, the traverse drive circuit 21 supplies a drive current for moving the optical head 3 to the position P2 to the traverse motor 22a, and the traverse motor 22a rotates the feed screw 22b to move the optical head 3 to the position P2. . Thereafter, the control unit 9 turns on the power-off signal 16 in this state, and shuts down the entire optical disc apparatus 100.

  Next, the operation of the optical disc device 100 when the optical head 3 is at the position P2 facing the rib 2b in the power-off state will be described. When the power-on request signal 11 becomes active, the control unit 9 generates a signal for sending the optical head 3 to the inner circumference side, for example, to the position P1, as the traverse control signal 18. In response to the traverse control signal 18, the traverse drive circuit 21 supplies a drive current for moving the optical head 3 to the position P1 to the traverse motor 22a, and the traverse motor 22a rotates the feed screw 22b to move the optical head 3 to the position P1. .

  Then, the control unit 9 sets the objective lens 4 in a state in which focus and tracking operations can be performed. Thereafter, according to the operation immediately before the power-off state, operations such as reading of a TOC (Table Of Contents) and a reproduction standby state are performed.

  As described above, during the reproduction of information from the optical disk 1, the objective lens 4 is located, for example, at the position P1 below the optical disk 1 and at which normal access is possible. In the abnormal situation described above, the collision between the optical disk 1 and the objective lens 4 can be avoided by the effect of the protection ring 5.

  Further, in the present embodiment, the objective lens 4 can be moved to the position P2 when the power is off. In this state, it is needless to say that the objective lens 4 does not collide with the optical disc 1 due to the effect of the protection ring 5, but the protection ring 5 does not collide with the optical disc 1 but only collides with the rib 2b. Therefore, even when the power is off and the servo control is cut off, it is possible to realize a state where there is nothing to damage the optical disc 1 regardless of any disturbance.

  The optical disc apparatus 100 is provided with an objective lens 4 for converging and irradiating the optical disc 1 with a laser beam, and protruding beyond the objective lens 4 toward the optical disc 1 and provided outside the optically effective area of the objective lens 4 to protect the objective lens 4. It has at least a protection ring 5 and a traverse mechanism for moving the objective lens 4 and the protection ring 5. The protection ring 5 is provided outside the outer circumference of the optical disk 1, and the surface on the objective lens 4 side is substantially the same as the incident surface of the optical disk 1. It has a rib 2b lying on a plane. Then, the traverse mechanism moves the objective lens 4 and the protection ring 5 to a position facing the surface of the rib 2b on the objective lens 4 side when the optical disk device is in the power-off state. Therefore, even when the power is off and the optical disk 1 remains inserted in the apparatus, the optical disk 1 and the protection ring 5 do not come into contact with each other. It is possible to prevent the optical disc 1 from being stained due to the contact.

  4 is a diagram showing an example of a portable movie device to which the optical disc device shown in FIG. 3 is applied, FIG. 4A is a side view of the movie device, and FIG. FIG. FIG. 5 is a diagram showing a state where the movie apparatus shown in FIG. 4 is tilted and left alone, and FIG. 5 (a) is a diagram showing a state where the optical head is below the optical disk, and FIG. (b) is a diagram showing a state where the optical head is located above the optical disk. Note that arrows shown in FIGS. 4B, 5A, and 5B indicate directions in which the gravity G acts.

  The movie device 200 shown in FIGS. 4A and 4B mainly includes a lens 31, an optical unit 32, and a drive unit 33, and the optical disk 1, the cartridge 2, and the optical head 3 are mounted on the drive unit 33. You. In response to a demand for a smaller and thinner device, the drive unit 33 usually has a rectangular parallelepiped shape similar to the shape of the cartridge 2.

  For example, in the case of the portable movie device 200, the drive unit 33 is designed to have a thin shape like the cartridge 2, as described above. In this case, for example, as shown in FIG. 4B, it is rare to save or leave the optical disk 1 in a state where the direction in which the gravity G acts and the radial direction of the optical disk 1 are parallel. The device 200 easily falls down and becomes unstable. Therefore, as shown in FIG. 5 (a) or 5 (b), it is usually stored and left with the so-called side face down. At this time, in the state shown in FIG. 5B, since the optical head 3 is located above the optical disc 1, the objective lens 4 is displaced in the direction of gravity G. That is, during normal storage, the objective lens 4 is displaced in the direction of the optical disk 1 with a probability of 50%. However, in the present embodiment, since the protection ring 5 only contacts the rib 2b, it is possible to avoid a situation where the protection ring 5 is left in contact with the optical disc 1 as in the conventional example described with reference to FIG. Can be.

  In the present embodiment, the movie device is described as an example in which the optical disc device is applied. However, the present invention is not particularly limited to this, and the present invention is applicable to other electric devices for reproducing optical discs such as CDs and DVDs. The present invention may be applied to an electric device having portability.

  The optical disk 1 is built in the cartridge 2, and the rib 2 b is provided near the outer edge connecting portion of the opening 2 a for allowing the objective lens 4 to approach the optical disk 1. By using the vicinity of the outer edge connecting portion of the second opening 2a as the rib 2b, it is not necessary to particularly provide the rib 2b, and the number of steps for providing the rib 2b can be reduced.

  In addition, even if the optical disk 1 (cartridge 2) is not in the power-off state and the objective lens 4 is located at P2, there is no particular problem as only interference with the rib 2b is eliminated.

(Embodiment 2)
Next, a second embodiment will be described. In the first embodiment, for example, it is necessary to move the objective lens from the position P1 to the position P2, for example, from the request for turning off the power until the power is actually turned off. However, there is a possibility that the side of the rib 2b and the protection ring 5 collide with the movement of the objective lens 4. By applying this embodiment, the problem can be avoided.

  FIG. 6 is a diagram showing a configuration of an optical disk device according to Embodiment 2 of the present invention. The optical disc device 101 according to the second embodiment shown in FIG. 6 includes an objective lens 4, a protection ring 5, a control unit 9, a focus drive circuit 20, a traverse drive circuit 21, and a traverse mechanism 22.

  The optical disk 1, cartridge 2, optical head 3, objective lens actuator 3a, objective lens 4, protection ring 5, traverse drive circuit 21, traverse mechanism 22, and the like used in the following description are the same as those in the first embodiment. Therefore, the description is omitted.

  The focus drive circuit 20 supplies a current for driving the objective lens 4 in a focus direction (a direction perpendicular to the optical disk surface) to the objective lens actuator unit 3a.

  The control unit 9 receives a power-on request signal 11, a power-off request signal 12, and an operation state signal 13, and outputs a power-off signal 16, an objective lens retreat signal 17, and a traverse control signal 18.

  The power-on request signal 11 may be a user's switch input, an input from a program timer, or the like. The power-off request signal 12 may be input from a timer or a controller for power saving in addition to a user's switch input. The operation state signal 13 is a state signal indicating an operation state such as whether the optical disk device 101 is currently in a standby state, is reproducing, is recording, or the like.

  The power-off signal 16 is output to a power-off circuit (for example, a power control IC). When the power-off signal 16 is turned on, the optical disk device 101 shuts down except for at least standby power.

  The objective lens retreat signal 17 is output to the focus drive circuit 20. When the objective lens retreat signal 17 is turned on, the focus drive circuit 20 drives the objective lens actuator 3a to move the objective lens 4 away from the optical disc 1.

  The traverse control signal 18 is output to the traverse drive circuit 21. When the traverse control signal 18 is output, the traverse drive circuit 21 moves the optical head 3 including the objective lens 4 to a target position in the radial direction of the optical disk.

  The power-off signal 16 and the objective lens retreat signal 17 are not turned on when the operation state signal 13 indicates the recording state.

  The operation of the optical disk device 101 configured as described above will be described below with reference to FIGS. FIG. 7 is a flowchart for explaining the operation of the optical disk device shown in FIG. 6, and FIG. 7A is a flowchart for explaining the operation of the optical disk device when a power-on request is issued. FIG. 7B is a flowchart for explaining the operation of the optical disk device when a power-off request is issued.

  First, it is assumed that the objective lens 4 is at the position P2 facing the rib 2b in the power-off state. In FIG. 7A, when the power-on request signal 11 becomes active, the control section 9 turns on the objective lens retreat signal 17 (step S1). In response to the objective lens retreat signal 17, the focus drive circuit 20 applies a current to the objective lens actuator 3a in a direction in which the objective lens 4 moves away from the optical disc 1, and moves the objective lens 4 at the position P2 away from the rib 2b. Then, the control unit 9 generates a signal for sending the optical head 3 to the inner circumference side, for example, to the position P1 as the traverse control signal 18. In response to the traverse control signal 18, the traverse drive circuit 21 supplies a drive current for moving the optical head 3 to the position P1 to the traverse motor 22a, and the traverse motor 22a rotates the feed screw 22b to move the optical head 3 to the position P1. (Step S2).

  Thereafter, the control unit 9 turns off the objective lens retreat signal 17 and outputs the signal to the focus drive circuit 20 (step S3). The focus drive circuit 20 stops generating a current for retreating the objective lens 4 from the optical disc 1, and enables the focus and tracking operation of the objective lens 4. Thereafter, in response to the operation immediately before the power-off state, operations such as the reading of the TOC and the reproduction standby state are performed (step S4).

  As described above, since the objective lens 4 is first separated from the rib 2b, even if the rib 2b and the protection ring 5 are in contact with each other before the power is turned on, the rib 2b and the protection ring 5 do not rub against each other. The protection ring 5 does not collide with the outer periphery of the optical disc 1.

  Further, after the power-on request from the power-off state, the objective lens actuator unit 3a moves the objective lens 4 from the optical disc 1 before moving the objective lens 4 from the position facing the rib 2b in the radial direction of the optical disc 1. Since the objective lens 4 is moved in the direction in which the objective lens 4 is moved away from the objective lens 4, the sliding of the objective lens 4 and the rib 2 b and the collision of the side surface of the objective lens 4 with the side surface of the optical disk 1 can be avoided. Damage to the portion 3a and the like can be reliably avoided.

  Next, the operation of the optical disk device 101 when the optical head 3 is at the position P1 in the power-on state will be described. In FIG. 7B, when the power-off request signal 12 becomes active, the control unit 9 detects a recording operation based on the operation state signal 13 and determines whether the recording operation has been completed (step S11). ). The controller 9 turns on the objective lens retreat signal 17 only when the recording operation is completed, controls the focus drive circuit 20 in the same manner as described above, and moves the objective lens 4 at the position P1, for example, from the optical disc 1. It is separated (step S12). After that, the control unit 9 controls the traverse drive circuit 21 and the traverse mechanism 22 by the traverse control signal 18 in the same manner as described above, and instructs the optical head 3 to move to the position P2 (step S13).

  The reason for confirming the operation state signal 13 is that when a power-off request is made during the recording operation on the optical disc 1, it is necessary to first complete the recording operation. In a general optical disk recording operation, there is a time lag between externally input data and data to be written to the optical disk 1. This is because external input data is temporarily stored in a buffer, recorded, and then written to an optical disk. Further, there is a case where the management information is recorded in the TOC area of the optical disc 1 at the end of the writing. Therefore, in the present embodiment, after passing through such a series of operations before the end, the objective lens 4 is separated from the optical disc 1 and moved to the position P2.

  As described above, the control unit 9 receives at least the operation state signal 13 indicating whether or not information is being recorded as one of the inputs, and outputs the power-off request signal while the operation state signal 13 indicates the information recording state. When receiving the signal 12, the controller waits until the operation state signal 13 changes to a state other than the information recording state, and then turns on the objective lens retreat signal 17. Therefore, the evacuation of the objective lens 4 is performed after the information is securely recorded, so that the convenience of the user can be improved and the reliability of the information can be improved.

  Then, the control section 9 turns off the objective lens retreat signal 17 at the position P2 (Step S14). As a result, there is a possibility that the protection ring 5 contacts the rib 2b, but there is no problem as described in the first embodiment. In this state, the control unit 9 turns on the power-off signal 16 and shuts down the entire optical disc device 101 (step S15).

  In this way, even when the power is off, the objective lens 4 is first separated from the optical disk 1, so that the rib 2b and the protection ring 5 do not collide with each other while the objective lens 4 moves from the position P1 to the position P2.

  In addition, the traverse mechanism 22 moves the objective lens 4 to a position facing the rib 2b after the power-off request is issued and before the power-off state is reached. The objective lens 4 can be arranged below the rib 2b, and the objective lens 4 and the optical disc 1 can be reliably protected.

  Also, the objective lens actuator 3a moves the objective lens 4 in a direction away from the optical disc 1 before the objective lens 4 reaches the position facing the rib 2b beyond the optical disc 1, so that the side of the objective lens 4 Collision with the side surface of the rib 2b can be avoided, and damage to the objective lens actuator 3a for driving the objective lens 4 can be reliably avoided.

  Further, the traverse mechanism 22 moves the optical system including the objective lens 4 in a substantially radial direction with respect to the optical disc 1, and the optical disc apparatus 101 requests at least a power-on request signal 11 for requesting power on and a power-off request. A power-off request signal 12 is input, and a power-off signal 16 for turning off the power, an objective lens retreat signal 17 for separating the objective lens 4 from the optical disc 1, and a traverse control signal 18 for controlling the traverse mechanism 22 are output. Is further provided. When the optical disk device 101 receives the power-off request signal 12 while the optical disk device 101 is powered on, the control unit 9 turns on the objective lens retreat signal 17 to separate the objective lens 4 from the optical disk 1, and then moves the objective lens 4 to the optical disk 1. A traverse control signal 18 for fully moving the outer peripheral side of the lens is output to the traverse mechanism 22, the objective lens 4 is arranged at a position facing the rib 2b, the objective lens retreat signal 17 is turned off, and a power-off signal 16 is generated. The power of the optical disk device 101 is turned off. Further, when the optical disk device 101 receives the power-on request signal 11 in the power-off state, the control unit 9 turns on the objective lens retreat signal 17 to separate the objective lens 4 from the rib 2b, and thereafter moves the objective lens 4 to the optical disk. Then, a traverse control signal 18 for moving the object lens 1 toward the inner circumference is output to the traverse mechanism 22 to move the objective lens 4 toward the inner circumference of the optical disc 1, and then the objective lens retract signal 17 is turned off.

  Therefore, before and after the movement of the traverse mechanism 22, the control unit 9 controls the objective lens retreat signal 17 for retreating the objective lens 4 from the optical disc 1 or the rib 2b according to the power supply state of the optical disc apparatus 101, and from any state. Also, the objective lens 4 and the optical disk 1 can be protected safely and automatically.

(Embodiment 3)
Next, a third embodiment will be described. In the optical disk devices 100 and 101 according to the first and second embodiments, the cartridge 2 having the optical disk 1 is used. However, the optical disk device according to the third embodiment uses only the optical disk 1. FIG. 8 is a diagram showing a configuration of an optical disk device according to Embodiment 3 of the present invention. Note that the configuration of the optical disk device 102 shown in FIG. 8 is almost the same as the configuration of the optical disk device 101 according to the second embodiment shown in FIG. Only parts different from the configuration of 101 will be described.

  In the optical disk device 102 shown in FIG. 8, the rib 2c is formed by projecting a part of the main body 6. The rib 2c is formed outside the outer circumference of the optical disc 1. The rib 2c formed on the main body 6 of the optical disk device 101 performs the same function as the rib 2b in the first and second embodiments. The traverse mechanism 22 moves the objective lens 4 and the protection ring 5 to a position facing the surface of the rib 2c on the objective lens 4 side when the optical disk device 101 is in the power-off state. The operation of the optical disk device 102 according to the third embodiment is the same as that of the optical disk device 101 according to the second embodiment, and a description thereof will not be repeated.

  As described above, even when the optical disc 1 is not built in the cartridge 2, the power is off, and the servo control is not applied, the optical disc 1 and the objective lens 4 never come into contact with each other, and even if a strong disturbance is received. It is possible to provide an excellent optical disk device 102 that does not damage the optical disk 1 and that can easily and easily improve the long-term reliability of recorded data at low cost. Further, even when the power is off and the optical disk 1 remains inserted in the apparatus, the optical disk 1 and the protection ring 5 do not come into contact with each other. It is possible to prevent the optical disc 1 from being stained due to the contact.

  The present invention is effective for any optical disk device having a high NA, for example, a device for high-density reproduction only, a device for phase change, and a magneto-optical disk, and is particularly effective for a portable optical disk device.

  Further, in the present embodiment, the objective lens 4 and the protection ring 5 are formed separately, but the present invention is not particularly limited to this, and the objective lens 4 and the protection ring 5 are formed integrally. Is also good. FIG. 9 is a cross-sectional view for describing a case where the objective lens and the protection ring are formed integrally. As shown in FIG. 9, the objective lens 41 includes a lens part 411 and a protection ring part 412. The lens portion 411 irradiates the optical disc 1 with convergent laser light. The protection ring portion 412 protrudes toward the optical disc 1 more than the lens portion 411, and protects the lens portion 411. In this case, the objective lens 4 and the protection ring 5 can be formed by one molding, and the number of manufacturing steps can be reduced. Further, since the objective lens 4 and the protection ring 5 are formed integrally, it is possible to prevent the protection ring 5 from falling off from the objective lens 4.

  Further, a screw feed mechanism has been described as an example of the traverse mechanism 22, but the present invention is not limited to this example, and may be arbitrarily configured such as a voice coil motor or an ultrasonic motor.

  Further, a position sensor when the optical head 3 is located at P2 may be provided, and a signal from this position sensor may be input to the control unit 9 and used for controlling the traverse control signal 18. In this case, the optical head 3 can be more reliably positioned.

  Further, in the present embodiment, the form in which the entire optical head 3 is moved by the traverse mechanism 22 as means for moving the objective lens 4 to the rib 2b has been described, but, for example, as a traverse mechanism in a broad sense, the objective lens actuator section 3a itself has The optical head 3 may have a capability, and a configuration in which a part of the optical head 3 is separated and the objective lens 4 is moved to the rib 2b is theoretically possible. In this case, it is only necessary to move a part of the optical head 3 instead of the entirety, so that an apparatus with a better space factor can be realized.

  The optical disk device according to the present invention prevents the optical disk and the objective lens from colliding with each other even when the optical disk and the objective lens never come into contact with each other even when the power is off and the servo control is not performed. An objective lens for converging and irradiating a laser beam onto the optical disc; a protective member protruding from the objective lens toward the optical disc and provided outside an effective optical area of the objective lens to protect the objective lens; and an objective lens and a protective member. It is useful as an optical disk device or the like having at least a traverse mechanism for moving the optical disk.

FIG. 3 is a diagram illustrating an example of a cartridge used for the optical disc device according to the first embodiment of the present invention. FIG. 2 is a view of the cartridge 2 shown in FIG. 1A as viewed from the end of a rib 2b toward the center of the optical disc 1. FIG. 2 is a diagram illustrating a configuration of an optical disc device according to Embodiment 1 of the present invention. 4A and 4B are diagrams illustrating an example of a portable movie device to which the optical disc device illustrated in FIG. 3 is applied, FIG. 4A is a side view of the movie device, and FIG. 4B is a front view of the movie device. is there. FIG. 5A is a diagram showing a state in which the movie device shown in FIG. 4 is tilted and left, and FIG. 5A is a diagram showing a state in which an optical head is below an optical disk; FIG. FIG. 3 is a diagram showing a state where the optical head is located above the optical disc. FIG. 8 is a diagram illustrating a configuration of an optical disc device according to a second embodiment of the present invention. FIG. 7 is a flowchart for explaining the operation of the optical disk device shown in FIG. 6, and FIG. 7A is a flowchart for explaining the operation of the optical disk device when a power-on request is issued. FIG. 7B is a flowchart for explaining the operation of the optical disk device when a power-off request is issued. FIG. 13 is a diagram illustrating a configuration of an optical disc device according to a third embodiment of the present invention. FIG. 3 is a cross-sectional view for describing a case where an objective lens and a protection ring are formed integrally. FIG. 11 is a diagram showing an example of the arrangement of a conventional optical disk and an objective lens. FIG. 4 is a diagram showing a state in which an optical disk and an objective lens are in contact with each other in a conventional optical disk device.

Explanation of reference numerals

Reference Signs List 1 optical disk 2 cartridge 2a opening 2b rib 3 optical head 3a objective lens actuator unit 4 objective lens 5 protection ring 9 control unit 21 traverse drive circuit 22 traverse mechanism 22a traverse motor 22b feed screw 100 optical disk device

Claims (9)

An objective lens for converging and irradiating a laser beam on the optical disc, a protection member protruding toward the optical disc side from the objective lens, and provided outside the optically effective area of the objective lens to protect the objective lens; and An optical disc device having at least a traverse mechanism for moving the protection member,
A rib provided outside the outer periphery of the optical disc and having a surface on the objective lens side substantially on the same plane as an incident surface of the optical disc;
The optical disk device, wherein the traverse mechanism moves the objective lens and the protection member to a position facing a surface of the rib on the objective lens side when the optical disk device is in a power-off state. The optical disk is contained in a cartridge,
2. The optical disk device according to claim 1, wherein the rib is provided near an outer edge connecting portion of an opening for allowing the objective lens to approach the optical disk.   The optical disk device according to claim 1, wherein the rib is provided on a main body of the optical disk device.   The optical disc according to any one of claims 1 to 3, wherein the traverse mechanism moves the objective lens to a position facing the rib after a power-off request is issued and before the power-off state is reached. apparatus.   A focusing mechanism for moving the objective lens in a direction away from the optical disk before the objective lens reaches a position facing the rib over the optical disk, further comprising a focusing mechanism. 13. An optical disk device according to   A focusing mechanism for moving the objective lens in a direction away from the optical disc before moving the objective lens from a position facing the rib in a radial direction of the optical disc after a power-on request from a power-off state; The optical disk device according to claim 1, further comprising: The traverse mechanism moves an optical system including the objective lens in a substantially radial direction with respect to the optical disc,
At least a power-on request signal and a power-off request signal are input, a power-off signal for turning off the power, an objective lens retreat signal for separating the objective lens from the optical disk, and a traverse control signal for controlling the traverse mechanism. Further comprising a control unit that outputs
When the optical disk device receives the power-off request signal while the optical disk device is powered on, the control unit turns on the objective lens retreat signal to separate the objective lens from the optical disk, and then moves the objective lens to the optical disk. Outputting the traverse control signal to move the outer peripheral side fully to the traverse mechanism, turning off the objective lens retracting signal after disposing the objective lens at a position facing the rib, and generating the power-off signal Turn off the power of the optical disk device,
When the optical disc device receives a power-on request signal in a power-off state, the objective lens retreat signal is turned on to separate the objective lens from the rib, and then move the objective lens toward an inner circumference of the optical disc. 2. The optical disk apparatus according to claim 1, wherein a traverse control signal is output to the traverse mechanism to move the objective lens toward an inner circumference of the optical disk before turning off the objective lens retreat signal.   The control unit, at least one of an operation state signal indicating whether or not information is being recorded is input, and when the power-off request signal is received while the operation state signal indicates the information recording state, 8. The optical disk device according to claim 7, wherein the controller waits until the operation state signal changes to a state other than the information recording state, and then turns on the objective lens retreat signal.   9. The optical disk device according to claim 1, wherein the objective lens and the protection member are formed integrally.

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