JP2011200087A - Record medium reproducing device, and motor driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a record medium reproducing device and a motor driving method, capable of returning to an operating state, when operation is stopped by an insulator in a brush motor.SOLUTION: When a carriage motor 9 constituted of the brush motor becomes impossible to operate, while an optical disk device 1 reproduces an optical disk 50, a microcomputer 36 repeats a forward rotating and a braking operation of a spindle motor 8, and vibrates the whole of a moving chassis 4 in which the carriage motor 9 and the spindle motor 8 are formed.

Description

  The present invention relates to a recording medium reproducing apparatus and a motor driving method using a brush motor when reading data from a recording medium.

  In an apparatus that reproduces an optical disc such as a CD (Compact Disc) or a DVD (Digital Versatile Disc) as a recording medium, the optical pickup lens that traces a track on the optical disc exceeds the operating amount when the optical disc is reproduced. In this case, the entire optical pickup is moved by the carriage motor so that the track can be traced and the information on the optical disk is read.

  FIG. 1 shows an excerpt of a part for moving an optical pickup of a conventional optical disk reproducing apparatus, and FIG. 2 shows a waveform diagram when the optical pickup is moved. The optical disk reproducing device shown in FIG. 1 includes a turntable 102, a spindle motor 103, an optical pickup 104, a carriage mechanism 105, and a carriage motor 106.

  The turntable 102 includes a substantially flat mounting surface for holding and rotating the optical disc 114 and a clamp portion for holding the center hole of the optical disc 114. The spindle motor 103 is mechanically connected to the turntable 102 and rotates the optical disk 114 placed on the turntable 102 by rotating the turntable 102.

  The optical pickup 104 is an objective lens that emits laser light to the optical disc 114 and receives reflected light from the recording surface of the optical disc 114, and an objective lens in the focus direction (vertical direction) and tracking direction (radial direction) with respect to the optical disc 114. An actuator for moving the optical disk, a laser diode for generating laser light to be applied to the optical disk 114, a photodiode for receiving the reflected light reflected from the optical disk 114, and the like. The reflected light received by the photodiode is converted into an electrical signal. To an RF circuit (not shown).

  The carriage mechanism 105 includes a lead screw (screw shaft) that is mechanically connected to a rotation shaft of a carriage motor 106 (to be described later) and meshes with a thread such as a rack gear formed on the optical pickup 104 or a thread groove. . The carriage motor 106 rotates by being driven by a drive circuit (not shown) or the like, and operates the carriage mechanism 105 to move the optical pickup 104 in the radial direction of the optical disk 114.

  As shown in FIG. 2, the optical pickup 104 is moved by observing a tracking error signal (TE signal) generated by an RF circuit or the like from a signal received by the optical pickup 104 and the signal voltage exceeds a certain level (reference value). In this case, the amount of operation from the center position of the objective lens is large, meaning that the trace of the track of the optical disk 114 cannot be followed only by the actuator. If the tracking error signal voltage is lowered by rotating the optical pickup 104 and the tracking error signal voltage is lowered, it means that the track can be traced. Therefore, the application of the voltage to the carriage motor 106 is stopped and the optical pickup 104 is moved. Stop. When the carriage motor 106 does not rotate at the initial voltage, the voltage is gradually increased until the carriage motor 106 rotates.

  In a normal optical disc, information is continuously recorded from the inner periphery to the outer periphery, so that a low voltage pulse is intermittently applied to the carriage motor 106 to repeatedly rotate and stop in one direction.

  Although the brush motor is often used for the carriage motor 106 described above from the viewpoint of cost, the brush motor generates an insulating organic compound (insulator) by the electric spark generated when the commutator deviates from the brush due to its structure. To do. When a low voltage pulse is intermittently applied to the brush motor and kept rotating in one direction, this insulating organic compound gradually accumulates on the brush and the commutator, and eventually the insulating organic compound is sandwiched between the brush and the commutator. There was a problem that the rotation of the motor was stopped by obstructing the flow.

  As a problem similar to this, the disk-shaped recording medium driving device described in Patent Document 1 has been proposed with respect to the problem that the commutators are electrically connected due to the accumulation of brush scissors in the gap of the commutator. In the disk-shaped recording medium driving device described in Patent Document 1, an electrode brush and a commutator are rotated by rotating a brush motor at a high speed according to an instruction from a brush wrinkle removing means after an accumulated time for reading data reaches a set accumulated time. The brush rods accumulated in the brush motor are blown away from the commutator by mutual sliding.

Japanese Patent No. 3885672

  However, in the disk-shaped recording medium driving apparatus described in Patent Document 1, the brush wrinkle removal operation is performed after the accumulated time for reading data reaches the set integration time, that is, the brush wrinkle removal operation is performed at regular intervals. However, it is an invention that prevents conduction between the commutators, and any countermeasures against the problem that the current flow is blocked by the insulating organic compound deposited between the brush and the commutator and the rotation of the motor is stopped are considered. Not.

  In addition, it is conceivable to detect and prevent the rotation of the motor before it stops due to the insulating organic compound, but the deposition rate of the insulating organic compound varies depending on the type of motor and the usage environment. If the motor stops, it is necessary to take measures to restore it to the operating state.

  Accordingly, an object of the present invention is to provide a recording medium reproducing device and a motor driving method capable of returning to an operating state when the operation is stopped by an insulator in a brush motor, for example.

  In order to solve the above-described problem, a recording medium playback apparatus according to claim 1 is a recording medium playback apparatus including a pickup that reads a signal from a recording medium and a plurality of motors, and one of the plurality of motors. One of the motors is a brush motor, and detecting means for detecting that the one motor is inoperable; and when the detecting means detects that the one motor is inoperable, the plurality of motors Motor control means for oscillating the entire device by driving other motors at a predetermined rotational speed or rotational direction.

  The motor driving method according to claim 8 is a motor driving method of a recording medium reproducing device including a pickup for reading a signal from a recording medium and a plurality of motors, and one motor among the plurality of motors is It is configured by a brush motor, and when it is detected that the one motor is inoperable, and when it is detected that the one motor is inoperable, the motor is predetermined with respect to another motor among the plurality of motors. The entire device is vibrated by being driven at the rotation speed or the rotation direction.

It is the block diagram which extracted the part which moves the optical pick-up of the conventional optical disk reproducing device. It is a wave form diagram at the time of moving an optical pick-up. It is a principal part perspective view of the optical disk apparatus concerning 1st Example of this invention. FIG. 4 is a plan view of the inner peripheral side of the optical pickup feeding mechanism of the optical disc apparatus shown in FIG. 3. It is the side view seen from the Y direction of FIG. FIG. 4 is a block diagram of the optical disc apparatus shown in FIG. 3. 4 is a flowchart of a reproduction operation of the optical disc apparatus shown in FIG. It is a flowchart of reproduction | regeneration operation | movement of the optical disk apparatus concerning 2nd Example of this invention.

  A recording medium playback apparatus according to an embodiment of the present invention will be described below. In the recording medium reproducing apparatus according to the embodiment of the present invention, the detection unit detects that one of the plurality of motors configured by the brush motor is inoperable, and the detection unit cannot operate one motor. Since the motor control means vibrates the entire device by driving the other motor at a predetermined rotational speed or rotational direction when it is detected that it is, the vibration generated by the rotation of the other motor Since the relative positions of the brush and the commutator in one motor can be changed and the conduction state can be recovered at that time, the motor can be returned to the operating state.

  Further, the detection means may detect that one motor is inoperable based on a tracking error signal generated from a signal read by the pickup. By doing so, for example, it is impossible to follow the track of the recording medium, so that it is detected that the tracking error signal exceeds the reference value, or the tracking servo is released because the recording medium does not rotate, and the tracking servo is released. An inoperable state of the motor can be detected by observing the error signal and detecting that the tracking servo is disconnected.

  Further, when the other motor is driven at a predetermined rotational speed or rotational direction from normal, the motor control means may apply a voltage higher than normal to one motor. By doing so, the conduction state can be easily recovered and the motor can be returned to the operation state.

  Further, the motor control means may drive other motors so as to repeat high-speed rotation and stop for a predetermined time. By doing so, larger vibrations can be frequently generated, the relative positions of the brush and the commutator can be easily changed, the conduction state is restored, and the motor can be returned to the operating state.

  In addition, a screw shaft mechanically connected to another motor, and a rack gear provided on the pickup and meshed with the screw shaft, when the detection means detects that one motor is inoperable The motor control means may cause other gears to rotate in the direction of moving the pickup to the end of the screw shaft and cause the rack gear to skip. By doing so, it is possible to return the spindle motor from the inoperable state to the operating state due to the vibration generated by the skipping of the rack gear.

  Further, the other motor is constituted by a stepping motor, and when the detecting means detects that one motor is inoperable, the motor control means moves to the end of the moving range of the pickup and moves the other motor. You may drive so that a motor may step out. By doing so, one motor can be returned from the inoperable state to the operating state by vibration generated when the other motor steps out.

  The plurality of motors may include at least a spindle motor that rotates the recording medium and a carriage motor that moves the pickup in the radial direction of the recording medium. In this way, when either the spindle motor or the pickup becomes inoperable, it can be returned to the operating state.

  In addition, the motor driving method according to the embodiment of the present invention detects that one of the plurality of motors configured by a brush motor is inoperable and detects that one motor is inoperable. In this case, since the entire device is vibrated by driving the other motor at a predetermined rotational speed or direction, the relative vibration between the brush and the commutator in one motor is caused by the vibration generated by the rotation of the other motor. Since the position can be changed and the conduction state can be restored at that time, the motor can be returned to the operating state.

  An optical disc apparatus 1 as a recording medium reproducing apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 3, the optical disc apparatus 1 includes a device main body and a playback unit 3. The device body includes a case (not shown) and a fixed chassis. The case forms an outer shell of the optical disc apparatus 1 and is formed in a flat box shape made of synthetic resin. The case is provided with an insertion slot for inserting and removing the optical disk 50 as a recording medium into and from the apparatus main body. The fixed chassis is made of sheet metal, is accommodated in the case, and is attached to the case.

  The reproducing unit 3 is accommodated in a fixed chassis. The reproducing unit 3 includes a moving chassis 4 made of sheet metal, a rotating table 5 that clamps and rotates the optical disk described above, and an optical pickup feeding mechanism 2.

  The movable chassis 4 is supported by a damper (not shown) so as to be movable with respect to the fixed chassis, that is, the device main body. The moving chassis 4 includes a substantially flat portion 6. The flat portion 6 is arranged so that both surfaces thereof are parallel to the bottom wall and the ceiling wall of the device main body. The flat portion 6 is provided with a through hole 7 extending along the radial direction of the optical disk 50 clamped by the rotary table 5 as will be described later. The flat portion 6 is provided with a carriage motor 9 for rotating a lead screw 11 described later. The carriage motor 9 is composed of a brush motor.

  The rotary table 5 includes a table rotatably supported at the center of the flat portion 6 and a spindle motor 8 that rotates the table. The table clamps the optical disc 50. The spindle motor 8 is attached to the flat portion 6 of the moving chassis 4. The rotary table 5 rotates the table on which the optical disk 50 is clamped by the spindle motor 8 to clamp the optical disk 50 and rotate the optical disk 50.

  The optical pickup feeding mechanism 2 is attached to the moving chassis 4 as shown in FIGS. The optical pickup feeding mechanism 2 includes a carriage motor 9, a lead screw 11 as a screw shaft, an optical pickup portion 12 as a pickup, a rack member 13 as a rack gear, a spring member 14, a bearing portion 15 and the like. Yes.

  The lead screw 11 is formed in a cylindrical shape, and a thread groove 16 and a thread 29 are formed on the outer peripheral surface thereof. Both ends of the lead screw 11 are located outside the outermost periphery and the outermost periphery of the optical disc 50 from which the optical pickup unit 12 reads information. The lead screw 11 is arranged such that its longitudinal direction is parallel to the radial direction of the optical disk 50 clamped by the rotary table 5. The end portion (one end portion) of the lead screw 11 is rotatably supported by the bearing portion 15, and the other end portion is similarly rotatably supported by the bearing portion 15.

  A pinion gear (not shown) arranged coaxially with the lead screw 11 is attached to one end portion of the lead screw 11, and the carriage motor is driven by a gear meshed with the pinion gear attached to the output shaft of the carriage motor 9. 9 is transmitted to the lead screw 11 through the pinion gear and the gear, and the lead screw 11 is rotated.

  The optical pickup unit 12 includes an optical pickup body that reads information (signals) recorded on the optical disc 50, a case 18, and a pair of guide shafts 19 and 20. The case 18 is made of synthetic resin or the like and accommodates the optical pickup body inside. The case 18 includes a window that does not prevent the optical pickup body from reading a signal recorded on the optical disk 50.

  The case 18 includes a hole 23 through which the guide shaft 19 passes and a convex portion 24 that abuts on the guide shaft 20. The hole 23 is formed in a circular shape. The hole 23 is formed with a small coefficient of friction with respect to the guide shaft 19. The convex portion 24 is formed in an arc shape along the outer shape of the guide shaft 20. The convex portion 24 is formed with a small friction coefficient with respect to the guide shaft 20.

  The guide shafts 19 and 20 are each formed in a round bar shape extending along one direction. The guide shafts 19 and 20 are fixed to the moving chassis 4 with a space between each other. The guide shafts 19 and 20 are arranged in parallel to each other and in parallel to the lead screw 11. The guide shaft 19 is supported at both ends by a guide shaft support portion 21 attached to the movable chassis 4, and the guide shaft 20 is supported at both ends by a guide shaft support portion 22 attached to the movable chassis 4.

  With the above-described configuration, the optical pickup unit 12 allows the optical pickup body housed in the case 18 to move along the longitudinal direction of the lead screw 11, that is, the radial direction of the optical disk 50, by the guide shafts 19 and 20. It is supported.

  As shown in FIGS. 4 and 5, the rack member 13 includes a band portion 25 formed in a band plate shape and a screw portion 26. The band portion 25 is arranged so that the longitudinal direction is orthogonal to the lead screw 11 and the guide shafts 19 and 20. One end of the band 25 is attached to the case 18 of the optical pickup unit 12.

  The screw portion 26 is provided at the other end portion of the band portion 25. The thread portion 26 includes a thread 27 that meshes with the thread groove 16 of the lead screw 11. The thread 27 of the thread portion 26 meshes with the thread groove 16 of the lead screw 11 when one end of the belt portion 25 is attached to the case 18. The screw portion 26 can be freely contacted and separated from the lead screw 11.

  That is, when the lead screw 11 rotates, the thread 27 of the thread portion 26 of the rack member 13 moves along the thread groove 16 of the lead screw 11. Therefore, the rack member 13 and the case 18 to which the rack member 13 is attached also move along the longitudinal direction of the lead screw 11 in conjunction with the rack member 13.

  As shown in FIG. 4 and the like, the spring member 14 is provided between the rack member 13 and the case 18 and biases the other end of the rack member 13 toward the lead screw 11.

  The bearing portion 15 is attached to the moving chassis 4 and supports the lead screw 11 rotatably.

  Next, the configuration of the control system of the optical disc apparatus 1 will be described with reference to the block diagram of FIG. The optical disk apparatus 1 includes an RF circuit 31, a carriage control circuit 32, a carriage motor drive circuit 33, a spindle motor drive circuit 34, a spindle control circuit 35, and a microcomputer in addition to the mechanical system shown in FIGS. 36.

  The RF circuit 31 generates a tracking error signal (TE signal) from the signal input from the optical pickup 12 and outputs the TE signal to the carriage control circuit 32.

  The carriage control circuit 32 receives the TE signal, outputs a control signal for the carriage motor drive circuit 33 based on the TE signal, and also outputs the TE signal to the microcomputer 36.

  The carriage motor drive circuit 33 generates a signal for driving the carriage motor 9 based on a control signal from the carriage control circuit 32 and outputs the signal to the carriage motor 9.

  The spindle control circuit 35 outputs a control signal to the spindle motor drive circuit 34 under the control of the microcomputer 36.

  The spindle motor drive circuit 34 generates a signal for driving the spindle motor 8 based on the control signal from the spindle control circuit 35 and outputs the signal to the spindle motor 8.

  The microcomputer 36 serving as detection means and motor control means is a microcomputer incorporating a memory such as a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory). In this embodiment, carriage control is performed. Based on the TE signal input from the circuit 32, the spindle motor drive circuit 34 is instructed to drive the spindle motor 8 such as rotation, stop, rotation speed, and rotation direction.

  Next, the reproducing operation in the optical disc apparatus 1 having the above-described configuration will be described with reference to the flowchart shown in FIG. The flowchart shown in FIG. 7 shows the operation particularly when the carriage motor 9 becomes inoperable due to the influence of the insulating organic compound, and is executed by the microcomputer 36. Therefore, in the flowchart of FIG. 7, the carriage motor 9 corresponds to one motor, and the spindle motor 8 corresponds to the other motor. Here, it is assumed that the optical pickup unit 12 performs a reproduction operation while moving in the outer peripheral direction of the optical disc 50.

  First, in step S101, it is determined whether or not the TE signal is greater than or equal to a reference value during reproduction of the optical disc 50. If the TE signal is greater than or equal to the reference value (Y), the process proceeds to step S102, and otherwise (N). Waits at this step. In this step, the amount of operation from the center position of the objective lens provided in the optical pickup unit 12 increases and the TE signal exceeds the reference value. It is determined whether or not it is impossible to follow only by itself.

  Next, in step S102, a voltage for moving the optical pickup unit 12 in the outer circumferential direction is applied to the carriage motor 9, and the process proceeds to step S103. In this step, the carriage control circuit 32 controls the carriage motor drive circuit 33 to drive the pulse based on the TE signal, thereby rotating the carriage motor 9 intermittently.

  Next, in step S103, it is determined again whether or not the TE signal is greater than or equal to the reference value. If the TE signal is greater than or equal to the reference value (Y), the process proceeds to step S104. If not (N), the process proceeds to step S101. Return. If the TE signal is greater than or equal to the reference value in this step (in the case of Y), the TE signal is less than or equal to the reference value even though the voltage for moving the optical pickup unit 12 in the outer circumferential direction is applied to the carriage motor 9. Therefore, it is determined that the carriage motor has become inoperable due to the insulating organic compound being deposited between the brush and the commutator, and the operations after step S104 are performed to remove the insulating organic compound and return the carriage motor. Do.

  First, in step S104, a counter N that counts the number of times of forward rotation and braking of a spindle motor 8 described later is initialized to 0, and the process proceeds to step S105. In addition, the address on the optical disc 50 where the optical pickup unit 12 is currently located is stored.

  Next, in step S105, voltage application to the carriage motor 9 is started, and the process proceeds to step S106. As the voltage applied in this step, a voltage higher than usual is applied to the carriage motor drive circuit 33.

  Next, in step S106, the counter N is counted up (+1), and the process proceeds to step S107.

  Next, in step S107, a voltage is applied to the spindle motor 8 to give the maximum acceleration in the forward rotation direction, and the process proceeds to step S108. In this step, the time is applied through the spindle motor drive circuit 34 for about 1 second, for example.

  Next, in step S108, a voltage is applied to the spindle motor 8 to give the maximum acceleration in the reverse rotation direction, and the process proceeds to step S109. In this step, the time is applied through the spindle motor drive circuit 34 for about 1 second, for example. By giving the maximum acceleration in the reverse rotation direction of this step, the rotation of the spindle motor 8 is braked (stopped). That is, in steps S107 and S108, the spindle motor 8 is driven to repeat high-speed rotation (predetermined number of rotations) and stop for a predetermined time.

  Next, in step S109, it is determined whether or not the counter N is 10 or more. If it is 10 or more (in the case of Y), the process proceeds to step S110. If it is less than 10 (in the case of N), the process returns to step S106. . That is, in this embodiment, the forward rotation of the spindle motor 8 and the braking operation are repeated 10 times. By repeating the forward rotation of the spindle motor 8 and the braking operation in this way, the entire moving chassis 4 vibrates, and the vibration propagates to the carriage motor 9 provided in the same moving chassis, and the relative positions of the brush and the commutator. When is changed, the resistance value between the brush and the commutator is lowered and the conduction state can be recovered.

  Further, when the carriage motor recovers the conduction state by this operation, the carriage motor starts to rotate. At this time, since a voltage higher than normal is applied in step S105, the carriage motor rotates at a higher rotation speed than normal. It will be.

  Next, in step S110, the voltage application to the carriage motor 9 performed from step S105 is stopped, and the process proceeds to step S111.

  Next, in step S111, the optical pickup unit 12 is moved to the innermost home position (a reference position for grasping the relative position between the optical disc 50 and the optical pickup unit 12), and the process proceeds to step S112. If the carriage motor 9 has returned from the inoperable state through the operations up to step S110 in this step, the optical pickup unit 12 starts moving to the Home position.

  Next, in step S112, it is determined whether or not the HomeSW provided at the Home position is turned on within 8 seconds. If it is turned on, the process proceeds to step S113. If not, the process proceeds to step S115. Although not shown, HomeSW is a switch provided at the home position of the innermost circumference of the optical disc apparatus 1, and is turned on when the optical pickup unit 12 moves and presses this switch, so that the optical pickup unit 12 is brought to the Home position. Detect that it has moved. Note that 8 seconds is an example, and it is only necessary that the optical pickup unit 12 can move to the Home position as long as the carriage motor 9 returns to the operating state.

  Next, in step S113, the optical pickup unit 12 is moved to the reproduction position stored in step S104, and the process proceeds to step S114. That is, since the carriage motor 9 has returned from the inoperable state, the optical pickup unit 12 is returned to the address on the optical disc 50 stored in step S104.

  Next, in step S114, the reproduction is resumed from the original position moved in step S113, and the process returns to step S101.

  On the other hand, in step S115, since the carriage motor 9 has not returned from the inoperable state, it is determined that there is an abnormality other than the insulating organic compound or an abnormality other than the carriage motor 9, and the reproduction operation is stopped as an error. At this time, the user may be notified of the error by a display means (not shown).

  According to the present embodiment, when the carriage motor 9 constituted by the brush motor becomes inoperable during reproduction of the optical disc 50 by the optical disc apparatus 1, the microcomputer 36 performs the forward rotation and braking operation of the spindle motor 8. By repeatedly vibrating the entire moving chassis 4 provided with the carriage motor 9 and the spindle motor 8, the relative position between the brush and the commutator in the carriage motor 9 is changed by the vibration, so that the resistance value between the brush and the commutator is changed. Can be reduced and the conductive state can be restored. Therefore, the carriage motor 9 can be returned to the operating state.

  Further, when the forward rotation of the spindle motor 8 and the brake application operation are repeated, a voltage higher than usual is applied to the carriage motor 9, so that the conduction state is easily restored, and the carriage motor 9 Can be returned to the operating state. Further, by rotating the carriage motor 9 with high rotation and high voltage, it is possible to clean the space between the brush and the commutator, and it is possible to prevent the recurrence by removing the insulator.

  In the flowchart shown in FIG. 7, the time for applying a voltage that gives the maximum acceleration in the forward rotation direction to the spindle motor 8 and the time for applying the voltage that gives the maximum acceleration in the reverse rotation direction are both. Although the same time (about 1 second), for example, the voltage for applying the maximum acceleration in the forward rotation direction to the spindle motor 8 is 5 seconds, and the voltage for applying the maximum acceleration in the reverse rotation direction. Both may be applied at different times, such as 3 seconds for the same time. Of course, the number of repetitions may be one or more, not ten.

  Next, an optical disc apparatus 1 according to a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  This embodiment has the same configuration as that shown in FIGS. 3 to 6, but differs from the first embodiment in that the spindle motor 8 is a brush motor and the carriage motor 9 is a DC motor. This embodiment is an example in which the spindle motor 8 becomes inoperable due to an insulating organic compound, that is, the spindle motor 8 becomes one motor and the carriage motor 9 becomes another motor. The flowchart of the reproducing operation of the optical disk apparatus 1 in a present Example is shown.

  First, in step S201, it is determined whether or not the tracking servo has come off. If it has come off, the process proceeds to step S202. If not, the process waits in this step. In this step, it is detected that the tracking servo is disconnected by monitoring the TE signal.

  Next, in step S202, servo setup is performed and the process proceeds to step S203. Here, the servo setup is to perform a focus and tracking servo setup operation so that signals can be correctly read from the optical disc 50.

  Next, in step S203, it is determined whether tracking servo is applied. If it is applied, the process returns to step S201. If not, the process advances to step S204. In this step, even though the servo setup operation was performed to apply the tracking servo, the tracking servo was not applied, so it was determined that the spindle motor became inoperable due to the accumulation of insulating organic compounds between the brush and the commutator. Then, the operation after step S204 is performed in order to remove the insulating organic compound and return the spindle motor 8.

  First, in step S204, a counter N that counts the number of times that the rack member 13 has caused tooth jumps by rotation of a carriage motor 9 described later is initialized to 0, and the process proceeds to step S205.

  Next, in step S205, voltage application to the spindle motor 8 is started, and the process proceeds to step S206. The voltage to be applied in this step is higher than usual and is applied via the spindle motor drive circuit 34 to rotate in the forward rotation direction. Of course, the rotation direction may be the reverse rotation direction.

  Next, in step S206, the counter N is incremented (+1), and the process proceeds to step S207.

  Next, in step S207, a voltage is applied to the carriage motor 9, and the process proceeds to step S208. In this step, a voltage that causes the optical pickup unit 12 to move in the inner circumferential direction via the carriage motor drive circuit 33 is applied for 5 seconds, for example. That is, the carriage motor 9 is driven in a predetermined rotation direction. By operating in this way, the optical pickup unit 12 moves to the innermost periphery, and the rack member 13 causes tooth jump with the lead screw 11 in an attempt to move further. When the moving chassis 4 vibrates due to the tooth jump, and the vibration propagates to the spindle motor 8 and the relative position of the brush and the commutator changes, the resistance value decreases and the conduction state can be restored. The time for applying the voltage to the carriage motor 9 is not limited to 5 seconds, but may be any time as long as the rack member 13 surely causes tooth skipping.

  Next, in step S208, it is determined whether or not the counter N is 3 or more. If it is 3 or more (in the case of Y), the process proceeds to step S209. If it is less than 3 (in the case of N), the process returns to step S206. . That is, in the present embodiment, the operation of generating the tooth jump of the rack portion 13 by rotating the carriage motor 8 is repeated three times.

  Next, in step S209, the voltage application to the spindle motor 8 performed from step S206 is stopped, and the process proceeds to step S210.

  Next, in step S210, the optical pickup unit 12 is moved to the innermost home position, and the process proceeds to step S211.

  Next, in step S211, servo setup is performed, and the process proceeds to step S212. In this step, the focus and tracking servo setup operations are performed in the same manner as in step S202 so that signals can be read correctly from the optical disc 50.

  Next, in step S212, it is determined whether or not tracking servo is applied in step S211. If it is applied, the process returns to step S201, and if not, the process advances to step S213. In this step, if the tracking servo is applied, it means that the spindle motor 8 has returned to the operating state and started to rotate.

  Next, in Step S213, since the spindle motor 8 has not returned from the inoperable state, it is determined that there is an abnormality other than the insulating organic compound or an abnormality other than the carriage motor 9, and the reproducing operation is stopped as an error. At this time, the user may be notified of the error by a display means (not shown).

  According to this embodiment, when the spindle motor 8 is constituted by a brush motor and becomes inoperable during reproduction, the carriage motor 9 is rotated to move the optical pickup unit 12 to the inner peripheral side, and the innermost side. By causing tooth movement of the rack member 13 around the circumference and vibrating the entire moving chassis 4, the relative position between the brush and the commutator in the spindle motor 8 is changed by the vibration, so that the resistance value between the brush and the commutator decreases. The conduction state can be restored. Therefore, the spindle motor 8 can be returned to the operating state.

  In the present embodiment, tooth skipping occurred at the innermost periphery, but it may be at the outermost periphery. However, since the innermost circumference is closer to the spindle motor 8, it is preferable because vibration is easily transmitted.

  Next, an optical disc apparatus 1 according to a third embodiment of the present invention will be described. The same parts as those in the first and second embodiments described above are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, the configuration is the same as in FIGS. 3 to 6, and the reproducing operation is the same as the flowchart in FIG. 8, and the spindle motor 8 is inoperable with an insulating organic compound. The difference from the second embodiment is that the motor 8 is composed of a brush motor and the carriage motor 9 is composed of a stepping motor.

  If the carriage motor 9 is composed of a stepping motor, a voltage is applied to the carriage motor 9 in step S207 in FIG. 8 so that the optical pickup unit 12 moves to the innermost circumference. In order to step out, the carriage motor 9 vibrates. When the moving chassis 4 vibrates due to the vibration and propagates to the spindle motor 8 and the relative position of the brush and the commutator changes, the resistance value decreases and the conduction state can be recovered. That is, the carriage motor 9 is driven to step out by moving to the end of the movement range of the optical pickup unit 12.

  According to this embodiment, when the spindle motor 8 is constituted by a brush motor and becomes inoperable during reproduction, the carriage chassis 9 constituted by a stepping motor is stepped out to vibrate the entire moving chassis 4. Thus, since the relative position of the brush and the commutator in the spindle motor 8 is changed by the vibration, the resistance value between the brush and the commutator is lowered and the conduction state can be recovered. Therefore, the spindle motor 8 can be returned to the operating state.

  Further, in the case of the present embodiment, vibration can be caused even if the rack member 13 is configured not to cause tooth skipping.

  In this embodiment, the carriage motor 9 is composed of a stepping motor, and the vibration is caused by the step out of the stepping motor. However, the vibration is caused by the tooth skipping of the rack member 13 as in the second embodiment. You may let them.

  In the above-described three embodiments, the spindle motor 8 and the carriage motor 9 provided in the moving chassis 4 have been described. For example, the moving chassis 4 is directly fixed to the device main body instead of the damper, and the vibration is applied to the entire device. If propagation is possible, another motor provided in the optical disc apparatus 1 can be vibrated, or the inoperable state of the other motor can be recovered.

  According to the embodiment described above, the following optical disk device 1 and motor driving method can be obtained.

(Supplementary Note 1) In an optical disc apparatus 1 including an optical pickup unit 12 that reads a signal from an optical disc 50, a spindle motor 8, and a carriage motor 9,
The carriage motor 9 is composed of a brush motor,
A microcomputer 36 for detecting that the carriage motor 9 is inoperable;
A microcomputer 36 that vibrates the entire device by driving the spindle motor 8 at a high speed when the microcomputer 36 detects that the carriage motor 9 is inoperable;
An optical disc apparatus 1 comprising:

(Supplementary note 2) A motor driving method of the optical disc apparatus 1 including an optical pickup unit 12 for reading a signal from the optical disc 50, a spindle motor 8, and a carriage motor 9,
The carriage motor 9 is composed of a brush motor. When the carriage motor 9 is detected to be inoperable, and the carriage motor 9 is detected to be inoperable, the spindle motor 8 is rotated at a high speed with respect to the spindle motor 8. A motor driving method characterized in that the entire device is vibrated by driving the motor.

  According to these optical disk apparatus 1 and motor driving method, the relative position between the brush and the commutator in the carriage motor 9 is changed by the vibration generated by the rotation of the spindle motor 8, so that the conduction state can be recovered. The motor 9 can be returned to the operating state.

  In addition, the Example mentioned above only showed the typical form of this invention, and this invention is not limited to an Example. That is, various modifications can be made without departing from the scope of the present invention.

1 Optical disk device (recording medium playback device)
8 Spindle motor (multiple motors)
9 Carriage motor (multiple motors)
11 Lead screw (screw shaft)
12 Optical pickup (pickup)
13 Rack member (rack gear)
36 Microcomputer (detection means, motor control means)

Claims (8)

In a recording medium playback device comprising a pickup for reading a signal from a recording medium and a plurality of motors,
One of the plurality of motors is constituted by a brush motor,
Detecting means for detecting that the one motor is inoperable;
Motor control means for vibrating the entire device by driving another motor of the plurality of motors at a predetermined rotational speed or rotational direction when the detection means detects that the one motor is inoperable. When,
A recording medium reproducing apparatus comprising:   2. The recording medium reproducing apparatus according to claim 1, wherein the detecting unit detects that the one motor is inoperable based on a tracking error signal generated from a signal read by the pickup.   2. The motor control unit applies a voltage higher than usual to the one motor when the other motor is driven at a predetermined rotation speed or rotation direction. Or the recording medium reproducing device according to 2;   The recording medium reproduction according to any one of claims 1 to 3, wherein the motor control unit drives the other motor to repeat high-speed rotation and stop for a predetermined time. apparatus. A screw shaft mechanically connected to the other motor;
A rack gear provided on the pickup and meshed with the screw shaft,
When the detection unit detects that the one motor is inoperable, the motor control unit rotates the other motor in a direction to move the pickup to the end of the screw shaft, and moves to the rack gear. 4. The recording medium reproducing apparatus according to claim 1, wherein tooth skipping is caused. The other motor is composed of a stepping motor,
When the detecting means detects that the one motor is inoperable, the motor control means drives the other motor to step out by moving to the end of the moving range of the pickup. The recording medium reproducing apparatus according to claim 1, wherein the recording medium reproducing apparatus is a recording medium reproducing apparatus.   The plurality of motors include at least a spindle motor that rotates the recording medium and a carriage motor that moves the pickup in a radial direction of the recording medium. The recording medium reproducing device described. A motor driving method for a recording medium reproducing apparatus comprising a pickup for reading a signal from a recording medium and a plurality of motors,
One of the plurality of motors is a brush motor, and when the one motor is detected to be inoperable and the one motor is detected to be inoperable, the plurality of motors is detected. A motor driving method characterized by causing the entire device to vibrate by driving the other motor of the motor at a predetermined rotational speed or rotational direction.

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