JP2011210302A - In-vehicle optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-vehicle optical disk device having simple loading mechanism and using a stepping motor, to prevent a component from failing even when an external force (vibration, shock, or centrifugal force) is applied while the device is not powered on.SOLUTION: The in-vehicle optical disk device includes: an optical pickup to read and write information on an optical disk, a traverse mechanism to move the optical pickup in the radial direction of the disk, an estimation part to estimate whether the optical pickup exists on an outer peripheral position in the traverse direction while the device is not powered on, and a control part which controls the traverse mechanism so as to move the optical pickup in the inner-peripheral direction when estimated that the optical pickup exists on the outer-peripheral position in the traverse direction while the device is not powered on.

Description

  The present invention relates to an in-vehicle optical disc apparatus.

  An optical disc apparatus is an apparatus that records and reproduces data by inserting and removing an optical disc such as a CD (Compact Disc) or a DVD (Digital Versatile Disc). In particular, an in-vehicle optical disk device mounted in an automobile or the like is assumed to be constantly subjected to vibration and / or impact (hereinafter simply referred to as “vibration impact”) from the outside. Therefore, there is a need for measures that can prevent the occurrence of component failures even if the process is added.

  As a conventional in-vehicle optical disc device, for example, those described in Patent Literature 1 and Patent Literature 2 are known. Patent Documents 1 and 2 describe a structure that locks an optical pickup so that it cannot move during transportation.

JP 7-006541 A Japanese Patent Laid-open No. Sho 63-039882

  However, the techniques described in Patent Document 1 and Patent Document 2 are insufficient as countermeasures against vibration and impact during non-energization for the following reasons.

  For in-vehicle optical disc devices, not only during transportation but also after mounting on the vehicle, road noise transmitted via tires, suspension, etc., vibration impact due to sudden acceleration / deceleration of the vehicle, and centrifugal force during cornering, etc. The external force is always received regardless of whether the current is applied or not.

  In addition, when the loading mechanism is designed with a simple configuration and a reduced number of parts in accordance with the recent demand for cost reduction, the floating holding mechanism (so-called mechanical lock mechanism) is not fully established and is locally May cause play. When there is play, the vibration impact durability changes depending on the position of the optical pickup. In particular, when the optical pickup is at the outer peripheral position in the traverse direction, the apparatus receives a greater vibration shock. Therefore, if a large vibration shock is continuously applied to the apparatus in a state where the optical pickup is at the outer peripheral position, failure of components such as damage to the oil damper or disconnection of the 4WS wire of the optical pickup is likely to occur.

  In particular, when a direct drive using a stepping motor or a traverse mechanism using a rack and pinion is adopted as a traverse mechanism of the optical pickup, the position restraint force of the optical pickup is weak, so the apparatus (optical disk apparatus) If an external force (vibration, impact, centrifugal force) is applied during non-energization, the optical pickup may unnecessarily move in the outer circumferential direction. In general, when the optical disc apparatus is not operating, it is in a non-energized state, so the position of the optical pickup cannot be controlled. Therefore, in the case of in-vehicle applications that are susceptible to external force, if the optical pickup moves unnecessarily in the outer circumferential direction, the optical pickup will not operate until the next energization or unless external force is accidentally applied in the inner circumferential direction. Since it continues to stay at the outer peripheral position, it becomes easy to cause a failure of parts.

  As described above, in an optical disk apparatus that uses a traversing mechanism using a stepping motor with a simplified loading mechanism, an external force (vibration, shock, centrifugal, etc.) remains in a state in which the optical pickup moves in the outer circumferential direction even during non-energization other than during transportation. There is a problem that the possibility of component failure increases by continuing to receive power.

  The object of the present invention is, for example, even if an optical disk device adopts a stepping motor with a simplified loading mechanism, even if an external force (vibration, impact, centrifugal force) is applied when the device is not energized, It is an object of the present invention to provide an in-vehicle optical disc device that can prevent the occurrence.

  An in-vehicle optical disc apparatus according to the present invention includes an optical pickup that reads and writes information on an optical disc, a traverse mechanism that moves the optical pickup in the radial direction of the disc, and the optical pickup at an outer peripheral position in the traverse direction when the device is not energized. An estimation unit that estimates whether or not the optical pickup is present, and the traverse mechanism that moves the optical pickup in the inner circumferential direction when the optical pickup is estimated to exist in the outer circumferential position in the traverse direction when the apparatus is not energized. And a control unit for controlling.

  Further, the in-vehicle optical disk device of the present invention includes an optical pickup that reads and writes information on an optical disk, a traverse mechanism that moves the optical pickup in the radial direction of the disk, and whether the optical pickup exists at an inner peripheral position in the traverse direction. A detection switch that detects whether or not the optical pickup is not present at the inner circumferential position in the traverse direction when the device is de-energized, and moves the optical pickup in the inner circumferential direction A controller for controlling the traverse mechanism.

  The in-vehicle optical disc apparatus of the present invention includes an optical pickup that reads and writes information from and on an optical disc, a traverse mechanism that moves the optical pickup in the radial direction of the disc, and an output of vibration impact detection means that detects vibration impact applied to the vehicle. The traverse mechanism to move the optical pickup in the inner circumferential direction when the vibration shock detected by the vibration shock detection means is not less than a predetermined value in a predetermined direction when the device is not energized. And a control unit for controlling. Preferably, the vibration impact detection means is an acceleration sensor.

  Further, the in-vehicle optical disc device of the present invention includes an optical pickup that reads and writes information on the optical disc, a traverse mechanism that moves the optical pickup in the disc radial direction, a centrifugal force calculator that calculates a centrifugal force applied to the vehicle, A controller that controls the traverse mechanism to move the optical pickup in an inner circumferential direction when the centrifugal force calculated by the centrifugal force calculator is greater than or equal to a predetermined value in a predetermined direction when the device is not energized; Have

  According to the present invention, for example, even in an optical disc apparatus that simplifies the loading mechanism and employs a stepping motor, even if an external force (vibration, impact, centrifugal force) is applied when the apparatus is not energized, a component failure Occurrence can be prevented.

  Specifically, according to the present invention, the position or movement of the optical pickup when the device (optical disc apparatus) is de-energized is detected and grasped, and it is estimated (expected) that the optical pickup exists at the outer peripheral position in the traverse direction. In this case, since the optical pickup is always sent in the inner circumference direction and is always located in the vicinity of the inner circumference, the state in which the optical pickup continues to exist at the outermost circumference position in the traverse direction is prevented, and the probability of component failure is reduced. be able to. Therefore, even when the loading mechanism has a simple configuration and a stepping motor is employed, high reliability can be ensured with respect to external force (vibration, impact, centrifugal force).

1 is a block diagram showing a configuration of an optical disc apparatus according to Embodiment 1 of the present invention. Flowchart showing the operation of the optical disc apparatus according to Embodiment 1 of the present invention. FIG. 3 is a block diagram showing a configuration of an optical disc apparatus according to Embodiment 2 of the present invention. Flowchart showing the operation of the optical disc apparatus according to Embodiment 2 of the present invention. FIG. 3 is a block diagram showing a configuration of an optical disc apparatus according to Embodiment 3 of the present invention. Flowchart showing the operation of the optical disc apparatus according to Embodiment 3 of the present invention.

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

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of an optical disc apparatus according to Embodiment 1 of the present invention.

  The optical disc apparatus 100 shown in FIG. 1 roughly includes an apparatus main body 100a and a controller 170. The apparatus main body 100 a includes an optical deck unit 110, a loading mechanism 120, a floating holding mechanism (mechanical lock mechanism) 130, a vibration isolation mechanism 140, a housing 150, and a control unit 160.

  The optical deck unit 110 is configured by mounting various components for recording or reproducing information on an optical disc (not shown). Specifically, the optical deck unit 110 includes, for example, a chassis 111 serving as a basic base unit, an optical pickup 112 that reads and writes information from and on an optical disk, a spindle mechanism 113 that rotates the optical disk, and an optical pickup 112 that has a disk radius. A traverse mechanism 114 for moving the optical pickup 112, an inner peripheral switch 115 for detecting the innermost peripheral position of the optical pickup 112 in the traverse direction, a detection switch 116 for detecting the presence or absence of an optical disk, and the like are mounted. . Each of the inner circumference switch 115 and the detection switch 116 is configured by, for example, a so-called a contact (make contact) that is turned on (closed) when an object is detected and is turned off (open) when no object is detected. Yes.

  The loading mechanism 120 is a mechanism for inserting / removing an optical disc, and is a mechanism portion that performs functions of an optical disc transport operation and a clamp operation, and a mechanical lock operation of a floating portion described later.

  The optical disc apparatus 100 has a floating structure that supports the optical deck unit 110 with respect to the casing 150 by an elastic member such as a spring and an anti-vibration damper (anti-vibration mechanism 140), similarly to a general in-vehicle optical disc apparatus. Yes. By adopting the floating structure, even if vibration is applied to the housing 150, this vibration can be attenuated and absorbed by the elastic member and the vibration damping damper. As a result, it is possible to prevent the occurrence of sound skipping or the like during reproduction of the optical disk due to vibration during vehicle travel.

  The optical disk device 100 also includes a floating holding mechanism (so-called mechanical lock mechanism) 130 that rigidly restrains the floating portion, that is, the optical deck portion 110 with respect to the housing 150, in the same manner as a general on-vehicle optical disk device. . This mechanical lock mechanism 130 is used to accurately determine the positional relationship between the optical disk to be transported and the turntable of the spindle mechanism 113 installed in the optical deck unit 110 during standby and when the optical disk is not present in the apparatus. It has a function of restraining the optical deck unit 110 with respect to the housing 150 when being inserted into and removed from the apparatus. When the optical disk is inserted and loaded, an optical disk transport operation and a clamping operation for fixing the optical disk to the turntable of the spindle mechanism 113 are performed. At this time, in order to correctly clamp the optical disk, the mechanical lock mechanism 130 is configured to restrict (lock) the operation of the optical deck unit 110 with respect to the housing 150 in the vertical direction, the front-rear direction, and the left-right direction.

  The anti-vibration mechanism 140 has a configuration in which the optical deck unit 110 is floated with respect to the housing 150 by the oil damper 141 and the support spring 142, similarly to the anti-vibration mechanism of a general in-vehicle optical disc apparatus. One ends of the oil damper 141 and the support spring 142 are attached to the housing 150. The oil damper 141 is an anti-vibration damper in which a silicone oil or the like is filled in a container made of an elastomer material or the like, for example. Although not shown, the oil damper 141 and the chassis 111 are generally fitted in such a manner that a damper shaft installed in the chassis 111 is inserted into a hole of a container of the oil damper 141.

  The number of oil dampers 141 and the number of support springs 142 are each composed of three or more in order to obtain equal vibration resistance in the front / rear / up / down / left / right directions. In order to facilitate the assembly, the support spring 142 is configured by arranging a compression coil spring so as to support the chassis 111 from below at a position coaxial with the oil damper 141.

  When the traverse mechanism 114 is disposed in the chassis 111, the traverse direction is designed to be 45 degrees or an angle close to the same value as the disc insertion direction. The moving distance of the optical pickup 112 for reading the information on the entire circumference of the disc is determined by the disc diameter. Therefore, generally, in many cases, the above-described layout is adopted in order to reduce the size of the optical disc apparatus 100.

  The traverse mechanism 114 is constituted by, for example, a stepping motor. The stepping motor is small and has high quietness during rotation, and can be positioned at a minute rotation angle according to the pulse train, and can be rotated at high speed, making it suitable for the feed mechanism of the optical pickup 112. ing. In addition to the direct drive using a stepping motor, the traverse mechanism 114 may be a direct drive using a linear motor, a traverse mechanism using a rack and pinion, or the like.

  However, when a direct drive using a stepping motor or a linear motor or a traverse mechanism using a rack and pinion is used, compared to a case where a traverse mechanism using a DC motor and a gear train via a worm gear is used. The position restraining force that prevents the optical pickup 112 from moving in the radial direction when the apparatus (the optical disc apparatus 100) is not energized is weak, and the optical pickup 112 may move unintentionally due to vibration shock applied from the outside. is there.

  The control unit 160 is a CPU (Central Processing Unit) provided inside the apparatus main body 100 a that controls the entire optical disc apparatus 100. The controller 170 is a CPU that gives a command signal corresponding to an operation to the optical disc device 100 when the operator operates the optical disc device 100. The configurations and operations of the control unit 160 and the controller 170 will be described in detail later.

  As described above, in-vehicle optical disc devices generally apply external forces such as road noise, vibration impact due to sudden acceleration / deceleration of the vehicle, and centrifugal force during cornering not only during transportation but also after installation in the vehicle. Regardless of whether energized or not energized, it is always received.

  Further, as described above, the optical disc apparatus is currently required to reduce the cost, and the number of parts must be reduced. The loading mechanism is also required to be simplified and inexpensive. When the loading mechanism is designed with a simple configuration by reducing the number of parts, the mechanical lock mechanism is not completely established, and play may occur locally in a predetermined direction.

  For example, when the arrangement of the anti-vibration mechanism 140 (the oil damper 141 and the support spring 142) shown in FIG. 1, the configuration in the traverse direction on the chassis 111 (approximately 45 degrees with respect to the disk insertion direction), and the mechanical lock position are employed. The mechanical lock mechanism 130 is effective in the restriction at the part on the disc insertion opening side, but the restriction in the vertical direction becomes loose at the part on the outer peripheral side of the optical pickup 112 position. That is, since the latter part has a structure in which the chassis 111 is supported not by the mechanical lock mechanism 130 but by the anti-vibration mechanism 140 (the oil damper 141 and the support spring 142), the latter part can swing in the vertical direction.

  Normally, in a state where the disk is inserted and clamped, the vibration shock transmitted from the outside can be attenuated and absorbed by the vibration isolation mechanism 140. However, when the mechanical lock is incomplete, not all installed oil dampers 141 and support springs 142 function, so that the vibration shock cannot be sufficiently attenuated or absorbed.

  Further, when vibration is applied in the vertical direction with the mechanical lock incomplete, the vibration impact applied to the optical pickup 112 itself varies depending on the position of the optical pickup 112. That is, when the optical pickup 112 is at the outermost peripheral position in the traverse direction, the moment of inertia becomes the largest with the mechanical lock position as a fulcrum, so that the vibration impact applied to the optical pickup 112 itself, the vibration isolation mechanism 140, and the like also increases. When the vibration shock causes a swing exceeding the space clearance between the chassis 111 and the housing 150, a collision occurs between the components, and a larger shock is generated.

  Therefore, if there is play because the mechanical lock is incomplete, the position of the optical pickup 112 in the traverse direction is different, so that the vibration shock received is not uniform and changes, and in particular, the optical pickup 112 is at the outermost peripheral position. Sometimes you will receive the greatest vibration shock. At this time, the durability of the components is remarkably lowered by the vibration shock received, and for example, as described above, component failures such as breakage of the oil damper 141 of the optical disc apparatus 100 and disconnection of the 4WS wire 112a of the optical pickup 112 are likely to occur. Become.

  Further, as described above, when the apparatus (optical disk apparatus 100) is not energized, the stepping motor has a weak positional restraining force in the traverse direction, and therefore the optical pickup 112 is caused by an external force in the outer circumferential direction due to vibration, impact, centrifugal force, or the like. May move in the outer circumferential direction. In particular, in-vehicle applications are likely to receive external forces (vibration, impact, centrifugal force) as described above, and therefore the frequency with which the optical pickup 112 moves in the outer circumferential direction increases. In addition, since it is in a non-energized state, the optical pickup 112 will remain at the outer peripheral position until the next energization or unless an external force is accidentally applied to the inner peripheral direction. It becomes easy to receive.

  Therefore, as described above, in an optical disc apparatus that simplifies the loading mechanism and employs a traverse mechanism using a stepping motor, external force (vibration, shock, etc.) is generated with the optical pickup 112 moving in the outer circumferential direction when the apparatus is not energized. , Centrifugal force), a component failure is likely to occur.

  Therefore, in the present embodiment, when the device (optical disc device 100) is de-energized, the device is activated at predetermined time intervals to detect the position of the optical pickup 112, and the optical pickup 112 is within the traverse direction. When it is determined that it is not at the circumferential position, the stepping motor (traverse mechanism 114) is energized to perform a feeding operation in the inner circumferential direction.

  That is, in the present embodiment, when the apparatus (optical disc apparatus 100) is not operating (that is, when no power is supplied), the state of the inner peripheral switch 115 is monitored at regular intervals, and the inner peripheral switch 115 is turned off. When in the (open) state, there is a possibility that the optical pickup 112 is present at the outer peripheral position, so an inner peripheral feed drive signal (voltage) is applied to the stepping motor (traverse mechanism 114). Specifically, when the device is de-energized, the device starts up at regular intervals even if the operator does not turn on the power, and the inner peripheral switch 115 installed on the chassis 111 is in an ON (closed) state. It is detected whether it is OFF (open). When the inner circumference switch 115 is in the OFF state, the optical pickup 112 is sent in the inner circumference direction. As a result, it is possible to prevent the optical pickup 112 from being always present at the outermost peripheral position when the device is not energized, simplifying the loading mechanism and preventing the occurrence of component failure even when a stepping motor is employed. be able to.

  In order to realize the above function, the control unit 160 includes an optical disc detection unit 161, a traverse inner circumferential position detection unit 162, and a traverse inner circumferential feeding unit 163. In addition, the controller 170 includes an optical disk device operation unit 171, an optical disk device activation unit 172, and a timer 173. The control unit 160 and the controller 170 are connected by wire or wireless. A vehicle starter 180 is connected to the controller 170.

  The optical disk detection unit 161 detects the presence or absence of an optical disk in the apparatus according to the output (ON / OFF) of the detection switch 116.

  The traverse inner circumference position detection unit 162 detects whether or not the optical pickup 112 exists at the innermost circumference position in the traverse direction according to the output (ON / OFF) of the inner circumference switch 115.

  The traverse inner periphery feed section 163 generates a drive signal (voltage) for traverse inner periphery feed for a predetermined time and outputs it to the stepping motor (traverse mechanism 114). Here, the “predetermined time” is set to, for example, a time required for the optical pickup 112 to move from the outermost position in the traverse direction to a position where the inner switch 115 is pressed (here, the innermost position). ing. As an example, the predetermined time is set to a few seconds (2 to 3 seconds) because it is necessary to set a low pulse rate with a sufficient drive torque in order to move the optical pickup 112 to the innermost circumferential position with certainty. Is set.

  The optical disk apparatus operation unit 171 operates the apparatus in response to an operation such as power ON / OFF of the operator for the apparatus (optical disk apparatus 100).

  The optical disk device activation unit 172 activates the device (optical disk device 100) in response to an output signal generated by the timer 173 or the like.

  The timer 173 generates an output signal every predetermined time when the device (the optical disc device 100) is not energized. Here, the predetermined time is set to an appropriate value (for example, about several minutes to several tens of minutes) according to the use environment of the vehicle, for example, in consideration of control load and effectiveness of the effect. . For example, in environments where long-term usage is expected and usage conditions are severe, such as commercial vehicles, the predetermined time is set shorter, and in usage environments where ordinary vehicles travel on ordinary roads, the maximum allowable time is allowed. It may be set to time.

  The vehicle starter 180 starts and stops driving the vehicle in response to an operator's ON / OFF operation on the vehicle. The operator's ON / OFF operation on the vehicle is performed by a vehicle start key such as an ignition (IG) switch, for example.

  Next, the operation of the optical disc apparatus 100 having the above configuration will be described using the flowchart of FIG.

  First, in step S1000, it is determined whether or not the vehicle start key (ignition switch) of the vehicle start unit 180 is turned on by the optical disc apparatus operation unit 171. As a result of this determination, if the vehicle start key is turned on (S1000: YES), the process proceeds to step S1100, and if the vehicle start key is not turned on, that is, remains in the OFF state (S1000: NO). ) Wait until the vehicle start key is turned ON. When the vehicle start key is turned on, the vehicle starter 180 starts driving the vehicle.

  In step S1100, the optical disc apparatus operation unit 171 determines whether or not the apparatus (optical disc apparatus 100) is in a non-energized state. As a result of this determination, if the device is in a non-energized state (S1100: YES), the process proceeds to step S1200, and if the device is not in a non-energized state, that is, in an energized state (S1100: NO), immediately. The process proceeds to step S1900.

  In step S1200, the timer 173 is reset by a command from the optical disc apparatus operation unit 171.

  In step S1300, the timer 173 is activated in response to a command from the optical disc apparatus operation unit 171. Thereby, the timer 173 starts counting elapsed time.

  In step S1400, the timer 173 determines whether the elapsed time being counted has exceeded a predetermined value. As a result of this determination, if the elapsed time exceeds the predetermined value (S1400: YES), the process proceeds to step S1500. If the elapsed time does not exceed the predetermined value (S1400: NO), the elapsed time is set to the predetermined value. Wait until it exceeds.

  In step S1500, the apparatus (optical disk apparatus 100) is activated. Specifically, when the elapsed time exceeds a predetermined value, the timer 173 outputs a signal to that effect to the optical disc apparatus activation unit 172. Then, the optical disk device activation unit 172 receives the output signal from the timer 173 and activates the device (optical disk device 100).

  In step S1600, the optical disc detection unit 161 determines whether the optical disc is in the apparatus. This determination is made by detecting the presence or absence of an optical disk in the apparatus according to the output (ON / OFF) of the detection switch 116. As a result of this determination, if the optical disk is in the apparatus (S1600: YES), the process immediately proceeds to step S1900. If the optical disk is not in the apparatus (S1600: NO), the process proceeds to step S1700.

  In step S1700, traverse inner circumference position detector 162 further determines whether or not inner circumference switch 115 is in the ON (closed) state. This determination is made by detecting whether or not the optical pickup 112 exists at the innermost circumferential position in the traverse direction according to the output (ON / OFF) of the inner circumferential switch 115. As a result of this determination, if the inner circumference switch 115 is in the ON state (S1700: YES), the process immediately proceeds to step S1900, and if the inner circumference switch 115 is not in the ON state, that is, is in the OFF (open) state (S1700). : NO), it is determined that there is a possibility that the optical pickup 112 exists at the outer peripheral position, and the process proceeds to step S1800.

  In step S1800, the traverse inner circumference feed section 163 executes a traverse inner circumference feed control operation. Specifically, the traverse inner circumference feeding unit 163 generates a drive signal (voltage) for traverse inner circumference feeding for a predetermined time and outputs it to the stepping motor (traverse mechanism 114). Here, the predetermined time is the time required for the optical pickup 112 to move from the outermost peripheral position in the traverse direction to the position where the inner peripheral switch 115 is pressed (here, the innermost peripheral position) as described above. (2 to 3 seconds).

  In step S 1900, it is determined whether or not the vehicle start key (ignition switch) of vehicle start unit 180 has been turned OFF by optical disc apparatus operation unit 171. As a result of this determination, when the vehicle start key is turned off (S1900: YES), the above-described series of processing ends, and when the vehicle start key is not turned off, that is, remains in the ON state ( (S1900: NO), the process returns to step S1100. When the vehicle start key is turned off, the vehicle start unit 180 stops the vehicle operation.

  As described above, according to the present embodiment, the position of the optical pickup 112 is periodically monitored when the apparatus (the optical disc apparatus 100) is de-energized, and the optical pickup 112 is located at a predetermined position on the inner peripheral side in the traverse direction (here Then, when it is not at the innermost circumferential position), the inner circumference of the optical pickup 112 is fed. For this reason, even when the loading mechanism is simplified and a stepping motor is used, the influence of external vibration shock amplification caused by the occurrence of a change in the position of the optical pickup 112 in the outer circumferential direction of the optical pickup 112 is eliminated, and the occurrence of component failure is prevented. can do.

  In the present embodiment, the timer 173 is used to periodically monitor the position of the optical pickup 112 (that is, the state of the inner peripheral switch 115), but the present invention is not limited to this. For example, as another example, instead of the timer 173, communication is performed with a host CPU that controls the apparatus (optical disk apparatus 100) at predetermined time intervals, the apparatus is activated, and the traverse inner circumference feed is performed in the predetermined case. You may issue a command to make it happen.

(Embodiment 2)
In the second embodiment, the possibility of movement of the optical pickup is determined by detecting a force that moves the optical pickup in the outer peripheral direction (here, acceleration indicating a vibration impact force) when the optical disk device is not energized. It is.

  FIG. 3 is a block diagram showing the configuration of the optical disc apparatus according to Embodiment 2 of the present invention. The optical disk device 200 shown in FIG. 3 has the same basic configuration as that of the optical disk device 100 corresponding to the first embodiment shown in FIG. The description is omitted.

  In the present embodiment, an acceleration detecting means (acceleration sensor) for detecting a vibration shock is provided outside the device (optical disk device 200), and the vibration shock from the outside is detected when the device is not energized. Is equal to or greater than a predetermined value, the stepping motor (traverse mechanism 114) is energized to perform a feed operation in the inner circumferential direction.

  In other words, in the present embodiment, when the device (optical disc device 200) is not operating (that is, when no power is supplied), the output of the acceleration sensor is monitored, and a predetermined value or more in a predetermined direction (traverse direction toward the outer periphery). When the acceleration is detected, there is a possibility that the optical pickup 112 moves in the outer circumferential direction, so that an inner circumferential feed driving signal (voltage) is applied to the stepping motor (traverse mechanism 114). Specifically, when the acceleration sensor installed outside the device detects an external force of a predetermined value or more that moves the optical pickup 112 from the outside in the outer circumferential direction when the device is not energized, The optical pickup 112 is sent in the circumferential direction. As a result, it is possible to prevent the optical pickup 112 from being always present at the outermost peripheral position when the device is not energized, simplifying the loading mechanism and preventing the occurrence of component failure even when a stepping motor is employed. be able to.

  In order to realize the above function, the controller 210 includes an acceleration calculation / determination unit 211 in addition to the optical disk device operation unit 171 and the optical disk device activation unit 172. The controller 160 and the controller 210 are connected by wire or wireless. In addition to the vehicle starting unit 180, a first acceleration sensor 221 and a second acceleration sensor 222 are connected to the controller 210.

  The first acceleration sensor 221 and the second acceleration sensor 222 are preferably installed outside the device (the optical disk device 200), and detect, for example, accelerations in the vehicle traveling direction and in the direction perpendicular to the vehicle traveling direction, respectively, and electrical signals. Output as. As a specific example of the acceleration sensors 221, 222, for example, an acceleration sensor that performs longitudinal acceleration detection for a driver's seat airbag is used as the first acceleration sensor 221, and an acceleration sensor that performs lateral acceleration detection for a side airbag is used. It can be used as the second acceleration sensor 222.

  The acceleration calculation / determination unit 211 combines the outputs of the first acceleration sensor 221 and the second acceleration sensor 222 to calculate an acceleration component in the traverse direction and compares it with a predetermined value. Here, the predetermined value is, for example, a value obtained experimentally by determining the acceleration at which the optical pickup 112 starts moving in the outer circumferential direction in the traverse mechanism 114. When the calculated acceleration component in the traverse direction exceeds a predetermined value, the acceleration calculation / determination unit 211 determines that the optical pickup 112 may move in the outer circumferential direction, and sends a signal to that effect to the optical disk device activation unit 172. Output to.

  Although the acceleration calculation / determination unit 211 is provided in the controller 210 in the present embodiment, the present invention is not limited to this. For example, the acceleration calculation / determination unit 211 is also realized by adding a function capable of calculating a composite output in the traverse direction and outputting a comparison result with a predetermined value to an airbag ECU (Electronic Control Unit). can do. Further, for example, the calculation function (calculation of the acceleration component in the traverse direction) of the acceleration calculation / determination unit 211 and the determination function (comparison determination between the acceleration component in the traverse direction and a predetermined value) are separated, and the former is the airbag ECU. In addition, the latter can be assigned to the controller 210.

  Next, the operation of the optical disc apparatus 200 having the above configuration will be described using the flowchart of FIG.

  Step S2000 and step S2100 are the same as step S1000 and step S1100 of the flowchart shown in FIG. 2 in the first embodiment, and thus detailed description thereof is omitted. Here, when vehicle operation is started by the vehicle starting unit 180 (S2000: YES), first, it is detected by the optical disk device operation unit 171 whether or not the device (optical disk device 200) is in a non-energized state (S2100). And when the said apparatus is a non-energized state (S2100: YES), the following processes are performed.

  In step S2200, the acceleration calculation / determination unit 211 constantly monitors the output of the first acceleration sensor 221 and the output of the second acceleration sensor 222 to calculate an acceleration component in the traverse direction.

  In step S2300, the acceleration calculation / determination unit 211 determines whether or not the acceleration component in the traverse direction calculated in step S2200 exceeds a predetermined value. Here, as described above, the predetermined value is a value obtained by empirically obtaining the acceleration at which the optical pickup 112 starts moving in the outer circumferential direction in the traverse mechanism 114. As a result of this determination, if the calculated acceleration component exceeds a predetermined value (S2300: YES), the process proceeds to step S2400, and if the calculated acceleration component does not exceed the predetermined value (S2300: NO), step S2200. Return to.

  In step S2400, the apparatus (optical disk apparatus 200) is activated. Specifically, when the calculated acceleration component in the traverse direction exceeds a predetermined value, the acceleration calculation / determination unit 211 outputs a signal to that effect to the optical disc apparatus activation unit 172. Then, the optical disk device activation unit 172 receives the output signal from the acceleration calculation / determination unit 211 and activates the device (optical disk device 200).

  Step S2500, step S2600, and step S2700 are the same as step S1600, step S1800, and step S1900 in the flowchart shown in FIG. 2 in the first embodiment, and thus detailed description thereof is omitted. Here, first, the presence or absence of an optical disk in the apparatus is detected by the optical disk detection unit 161 (S2500). If the optical disk is in the apparatus (S2500: YES), the process is terminated. On the other hand, when the optical disk is not in the apparatus (S2500: NO), the traverse inner circumference feed unit 163 generates a drive signal (voltage) for traverse inner circumference feed for a predetermined time, and the stepping motor (traverse mechanism 114). (S2600). Here, the predetermined time is the time required for the optical pickup 112 to move from the outermost peripheral position in the traverse direction to the position where the inner peripheral switch 115 is pressed (here, the innermost peripheral position) as described above. (2 to 3 seconds). The series of processes is repeated until the vehicle start key is turned off (S2700: YES).

  As described above, according to the present embodiment, when the device (optical disk device 200) is de-energized, the generation of an external force that moves the optical pickup 112 in the outer circumferential direction is generated outside the device (optical disk device 200). If the detected value (specifically, the calculated value of the acceleration component in the traverse direction) is larger than a predetermined value, it is detected by the installed acceleration sensors 221 and 222. Do. For this reason, even when the loading mechanism is simplified and a stepping motor is used, the influence of external vibration shock amplification caused by the occurrence of a change in the position of the optical pickup 112 in the outer circumferential direction of the optical pickup 112 is eliminated, and the occurrence of component failure is prevented. can do.

  In the present embodiment, two acceleration sensors 221 and 222 that detect acceleration in the vehicle traveling direction and the direction perpendicular to the vehicle traveling direction are used as the acceleration sensor. It is not limited. For example, the direction of acceleration to be detected may be wide and may be directions perpendicular to each other in the same plane including the traverse direction. Further, the number of accelerations is not limited to two, and may be three or more.

  Moreover, in this Embodiment, although the 1st acceleration sensor 221 and the 2nd acceleration sensor 222 are each connected to the controller 210, it is not limited to this. For example, the controller 210 may input outputs of the first acceleration sensor 221 and the second acceleration sensor 222 from another ECU.

(Embodiment 3)
The third embodiment is a case where the possibility of movement of the optical pickup is determined by detecting the force (here, centrifugal force applied to the vehicle) that moves the optical pickup in the outer peripheral direction when the optical disk device is not energized. is there.

  FIG. 5 is a block diagram showing a configuration of the optical disc apparatus according to Embodiment 3 of the present invention. The optical disk device 300 shown in FIG. 5 has the same basic configuration as the optical disk device 100 corresponding to the first embodiment shown in FIG. 1, and the same components are denoted by the same reference numerals. The description is omitted.

  In the present embodiment, the device (optical disc device 300) is provided with means for detecting the steering operation angle for controlling the traveling direction of the vehicle and means for detecting the traveling speed of the vehicle. When energized, the centrifugal force is calculated from the steering operation angle and the traveling speed of the vehicle, and when the calculated value is equal to or greater than a predetermined value, the stepping motor (traverse mechanism 114) is energized to perform the feeding operation in the inner circumferential direction. ing.

  That is, in the present embodiment, when the device (optical disk device 300) is not operating (that is, when no power is supplied), the steering operation angle and the value of the vehicle speed sensor (vehicle speed pulse) are detected, and this detected value When the centrifugal force applied to the vehicle (and thus the optical disc apparatus 300) is calculated (estimated) from the vehicle and a centrifugal force of a predetermined value or more is calculated in a predetermined direction (traverse direction), the optical pickup 112 may move in the outer circumferential direction. Therefore, an inner circumference driving signal (voltage) is applied to the stepping motor (traverse mechanism 114). Specifically, when it is estimated that an external force greater than a predetermined value is applied to move the optical pickup 112 in the outer circumferential direction by centrifugal force when the device is not energized and the vehicle is cornering. Sends the optical pickup 112 in the inner circumferential direction. As a result, it is possible to prevent the optical pickup 112 from being always present at the outermost peripheral position when the device is not energized, simplifying the loading mechanism and preventing the occurrence of component failure even when a stepping motor is employed. be able to.

  In order to realize the above function, the controller 310 includes a centrifugal force calculation / determination unit 311 in addition to the optical disc device operation unit 171 and the optical disc device activation unit 172. The controller 160 and the controller 310 are connected by wire or wireless. In addition to the vehicle starter 180, a steering operation angle detector 321 and a vehicle speed detector 322 are connected to the controller 310.

  The steering operation angle detection unit 321 detects the steering operation angle operated by the driver while the vehicle is traveling.

  The vehicle speed detection unit 322 is installed at a predetermined location of the vehicle, and detects the traveling speed of the vehicle by reading a pulse signal output according to the rotational speed of an axle, wheels, or the like, for example. The vehicle speed detection part 322 is comprised with the vehicle speed sensor, for example.

  The centrifugal force calculation / determination unit 311 calculates the centrifugal force in the traverse direction from the output of the steering operation angle detection unit 321 and the output of the vehicle speed detection unit 322, and compares it with a predetermined value. Here, the predetermined value is, for example, a value obtained by experimentally determining the centrifugal force at which the optical pickup 112 moves in the outer circumferential direction in the traverse mechanism 114.

  Here, the calculation principle of the centrifugal force will be described.

Assuming that the steering reference angle θ ₀ is the steering operation angle in the straight traveling state, the steering displacement angle Δθ (= θ−θ ₀ ) and the vehicle tire steering angle Δθ _t have the relationship of the following equation (1). Here, _{k 1} is a proportionality constant.
Δθ _t = k ₁ · Δθ (1)

Further, since the corner radius R of the vehicle travel locus is substantially in inverse proportion to the tire steering angle Δθ _t of the vehicle, the following equation (2) is established. Here, _{k 2} is a proportionality constant.
1 / R≈k ₂ · Δθ _t = k ₁ · k ₂ · Δθ (2)

On the other hand, when the vehicle travel speed V detected by the vehicle speed detection unit 322 is used, the centrifugal force F applied to the optical pickup 112 is expressed by the following equation (3). Here, m is the mass [g] of the optical pickup 112. Here, it is assumed that the traverse direction is 45 degrees with respect to the disk insertion direction (straight direction of the vehicle).
F = m · V ² / R · cos (90 ° − (Δθ _t + 45 °))
= M · V ² · (k ₁ · k ₂ · Δθ) · sin (k ₁ · Δθ + 45 °) (3)

  Next, the operation of the optical disc apparatus 300 having the above configuration will be described using the flowchart of FIG.

  Steps S3000 and S3100 are the same as steps S1000 and S1100 in the flowchart shown in FIG. 2 in the first embodiment, and thus detailed description thereof is omitted. Here, when vehicle operation is started by the vehicle starting unit 180 (S3000: YES), first, the optical disk device operation unit 171 detects whether or not the device (optical disk device 300) is in a non-energized state (S3100). And when the said apparatus is a non-energized state (S3100: YES), the following processes are performed.

In step S3200, the centrifugal force is calculated from the steering operation angle and the vehicle speed. Specifically, steering angle detection section 321 detects a steering angle theta, and outputs a steering angular displacement Δθ from the reference angle theta _0. Here, the reference angle θ ₀ is the steering operation angle in the straight traveling state as described above. The vehicle speed detector 322 detects the vehicle speed V. The centrifugal force calculation / determination unit 311 uses the steering displacement angle detection value Δθ from the steering operation angle detection unit 321 and the vehicle speed detection value V from the vehicle speed detection unit 322 according to the above formula (optical disk). (Apparatus 300) As a result, the centrifugal force F in the traverse direction acting on the optical pickup 112 is calculated.

  In step S3300, the centrifugal force calculation / determination unit 311 determines whether the centrifugal force F in the traverse direction calculated in step S3200 has exceeded a predetermined value. Here, the predetermined value is a value obtained by experimentally determining the centrifugal force at which the optical pickup 112 moves in the outer circumferential direction in the traverse mechanism 114 as described above. As a result of this determination, when the calculated centrifugal force F exceeds a predetermined value (S3300: YES), the process proceeds to step S3400, and when the calculated centrifugal force F does not exceed the predetermined value (S3300: NO), The process returns to step S3200.

  In step S3400, the apparatus (optical disk apparatus 300) is activated. Specifically, when the calculated centrifugal force F in the traverse direction exceeds a predetermined value, the centrifugal force calculation / determination unit 311 outputs a signal to that effect to the optical disc apparatus activation unit 172. Then, the optical disk device activation unit 172 receives the output signal from the centrifugal force calculation / determination unit 311 and activates the device (optical disk device 300).

  Step S3500, step S3600, and step S3700 are the same as step S1600, step S1800, and step S1900 in the flowchart shown in FIG. 2 in the first embodiment, and thus detailed description thereof is omitted. Here, first, the presence or absence of an optical disk in the apparatus is detected by the optical disk detection unit 161 (S3500). If the optical disk is in the apparatus (S3500: YES), the process is terminated. On the other hand, when the optical disk is not in the apparatus (S3500: NO), the traverse inner circumference feed section 163 generates a traverse inner circumference feed signal (voltage) for a predetermined time, and the stepping motor (traverse mechanism 114). (S3600). Here, the predetermined time is the time required for the optical pickup 112 to move from the outermost peripheral position in the traverse direction to the position where the inner peripheral switch 115 is pressed (here, the innermost peripheral position) as described above. (2 to 3 seconds). The series of processes is repeated until the vehicle start key is turned off (S3700: YES).

  As described above, according to the present embodiment, when the device (optical disc device 300) is not energized, the generation of centrifugal force that moves the optical pickup 112 in the outer peripheral direction is determined from the vehicle steering operation angle and the vehicle speed. When the calculated value (here, specifically, the centrifugal force in the traverse direction) is larger than a predetermined value, the inner circumference of the optical pickup 112 is fed. For this reason, even when the loading mechanism is simplified and a stepping motor is used, the influence of external vibration shock amplification caused by the occurrence of a change in the position of the optical pickup 112 in the direction of the outer periphery of the traverse is eliminated, thereby preventing the occurrence of component failure can do.

  In the present embodiment, the steering operation angle detection unit 321 and the vehicle speed detection unit 322 are connected to the controller 310, respectively, but are not limited thereto. For example, the controller 310 may input the outputs of the steering operation angle detector 321 and the vehicle speed detector 322 from another ECU.

  The optical disk apparatus according to the present invention is, for example, an optical disk apparatus that simplifies the loading mechanism and employs a stepping motor, even if an external force (vibration, impact, centrifugal force) is applied when the apparatus is not energized. It has the effect of suppressing the impact, preventing the occurrence of component failures (that is, reducing the probability of occurrence of component failures), and ensuring high reliability. It is useful as a navigation device.

100, 200, 300 Optical disk device 100a Device main body 110 Optical deck unit 111 Chassis 112 Optical pickup 112a 4WS wire 113 Spindle mechanism 114 Traverse mechanism 115 Inner switch 116 Detection switch 120 Loading mechanism 130 Floating holding mechanism (mechanical lock mechanism)
140 Anti-Vibration Mechanism 141 Oil Damper 142 Support Spring 150 Case 160 Control Unit 161 Optical Disc Detection Unit 162 Traverse Inner Perimeter Position Detection Unit 163 Traverse Inner Peripheral Feed Unit 170, 210, 310 Controller 171 Optical Disc Device Operation Unit 172 Optical Disc Device Activation Unit 173 Timer 180 Vehicle start unit 211 Acceleration calculation / determination unit 221 First acceleration sensor 222 Second acceleration sensor 311 Centrifugal force calculation / determination unit 321 Steering operation angle detection unit 322 Vehicle speed detection unit

Claims (10)

An optical pickup for reading and writing information on an optical disc;
A traverse mechanism for moving the optical pickup in the disk radial direction;
An estimation unit that estimates whether or not the optical pickup is present at an outer peripheral position in the traverse direction when the device is not energized;
A controller that controls the traverse mechanism to move the optical pickup in the inner circumferential direction when the optical pickup is estimated to be present at the outer circumferential position in the traverse direction when the device is not energized;
An in-vehicle optical disc apparatus having An optical pickup for reading and writing information on an optical disc;
A traverse mechanism for moving the optical pickup in the disk radial direction;
A detection switch for detecting whether or not the optical pickup is present at an inner circumferential position in the traverse direction;
Control that controls the traverse mechanism to move the optical pickup in the inner circumferential direction when the detection switch detects that the optical pickup does not exist in the inner circumferential position in the traverse direction when the device is not energized And
An in-vehicle optical disc apparatus having The detection switch is
It is an inner circumference switch that detects the innermost circumference position in the traverse direction of the optical pickup,
The in-vehicle optical disc device according to claim 2. An optical pickup for reading and writing information on an optical disc;
A traverse mechanism for moving the optical pickup in the disk radial direction;
An input unit for inputting an output of a vibration shock detecting means for detecting a vibration shock applied to the vehicle;
A control unit that controls the traverse mechanism so that the optical pickup is moved in the inner circumferential direction when the vibration shock detected by the vibration shock detection means is greater than or equal to a predetermined value in a predetermined direction when the device is not energized;
An in-vehicle optical disc apparatus having The vibration impact detecting means is
An acceleration sensor,
The controller is
When the acceleration detected by the acceleration sensor is not less than a predetermined value in the traverse direction when the device is not energized, the traverse mechanism is controlled to move the optical pickup in the inner circumferential direction.
The in-vehicle optical disc device according to claim 4. The vibration impact detecting means is
A plurality of acceleration sensors,
The controller is
When the device is not energized, the acceleration component in the traverse direction is calculated from the accelerations detected by the plurality of acceleration sensors, and the optical pickup is moved in the inner circumferential direction when the obtained acceleration component is equal to or greater than a predetermined value. Controlling the traverse mechanism,
The in-vehicle optical disc device according to claim 5. The plurality of acceleration sensors are:
Two acceleration sensors for detecting accelerations in directions perpendicular to each other in the same plane including the traverse direction;
The in-vehicle optical disc device according to claim 6. An optical pickup for reading and writing information on an optical disc;
A traverse mechanism for moving the optical pickup in the disk radial direction;
A centrifugal force calculator for calculating centrifugal force applied to the vehicle;
A controller that controls the traverse mechanism to move the optical pickup in an inner circumferential direction when the centrifugal force calculated by the centrifugal force calculator is greater than or equal to a predetermined value in a predetermined direction when the device is not energized;
An in-vehicle optical disc apparatus having The centrifugal force calculator is
Calculate the centrifugal force in the traverse direction from the steering operation angle and the running speed of the vehicle,
The in-vehicle optical disc device according to claim 8. The traverse mechanism is
Moving the optical pickup in the radial direction of the disk by a stepping motor;
The in-vehicle optical disc device according to any one of claims 1 to 9.

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