JP2005116040A - Disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: In the disk chucking, there is always a problem that a phenomenon in which a disk medium is supported and fixed in a state where it is not normally mounted at a predetermined position on a spindle motor turntable, a so-called mischucking phenomenon occurs. doing.
A disk apparatus according to the present invention includes a spindle motor which is a means for rotating a disk medium mounted at a predetermined position, a driving means for the spindle motor, and a rotation direction detecting means for detecting the direction of rotation of the spindle motor. A rotation direction switching means for switching the direction of rotation of the spindle motor, a rotation number detection means for detecting the rotation state of the spindle motor, and a control device for controlling the respective means. The control means rotates the spindle motor alternately at least once in the forward and reverse directions at the time of the disk medium loading operation.
[Selection] Figure 1

Description

  The present invention relates to a disk chucking means in a disk device for recording or reading information on a disk.

Disc-shaped information recording and reproducing media such as floppy (registered trademark) disks, MD (mini discs), CDs, DVDs, and the like have been conventionally used by a means for transporting a disk medium called a disk loading means including manual. , A spindle which is a drive means for rotating the disk medium carried in the disk apparatus and recorded in the disk apparatus for recording or reproducing information on the disk medium It is structured to be attached to a motor.
Mounting the disk medium to the spindle motor in this manner is generally called disk chucking. As described below, two types of disk chucking methods have been proposed. In view of various conditions in the system, a suitable method is applied.

  One is applied to CDs and DVDs, and a schematic diagram is shown in FIG. As shown in FIG. 7, the disk medium 5 is sandwiched between another piece of a disk clamper component 23 and a turntable portion 11 on a spindle motor and supported in a predetermined posture. This is called the clamp method.

  In this mechanical chucking method, a magnetic member is usually incorporated into the disc clamper 23, or the disc clamper component 23 itself is made of a magnetic material and is installed in a predetermined position in the spindle motor 11 ( In many cases, the disk medium 5 is sandwiched and supported and fixed between the disk clamper component 23 and the spindle motor 11 by being attracted by a magnetic force (not shown).

  This mechanical chucking method has an advantage that the disk medium 5 itself can be manufactured at a very low cost because it is not necessary to specially process parts for chucking. However, on the other hand, while the disk medium 5 is being transported (loaded) into the disk device, the disk clamper component 23 is retracted to the upper part of the disk medium 23 to cause interference with the disk medium 5. As a result, the thickness of the disk device may be disadvantageous.

  There is a system in which the disk medium is enclosed in a disk cartridge together with another piece of disk clamper. However, because the disk cartridge still requires extra space in the thickness direction of the disk cartridge, the result is that the entire disk cartridge is a conventional product. It is thicker.

  Another chucking method is as shown in FIG. 9 and is mainly used in systems such as floppy disks, MDs, and MO (magneto-optical disks). In general, it is often called a magnet chucking (magnet clamp) system. In this magnet chucking method, a clamper part 51 having a role equivalent to that of the disk clamper described above is incorporated in the disk medium 50 to be integrated, and the clamper part 51 itself is engaged with a predetermined position of the spindle motor 55. It is supported in a desired posture.

  In this magnet chucking method, the disk clamper 51 attached to the disk medium 50 is made of a magnetic material, and the disk medium 50 is moved to a predetermined position by the attractive force of a magnet 56 incorporated at a predetermined position in the spindle motor 55. In general, it is configured to be mounted and supported and fixed to.

The magnetic chucking method has a demerit that increases the cost of the disk because it requires processing such as incorporating the disk clamping component 51 into the disk medium 50 itself. When loading into the device, it is not necessary to have a mechanism structure in which the disk clamper parts must be retracted to avoid interference with the disk medium as in the previous mechanical chucking method. As a result, there are advantages that the dead space of the disk device can be reduced and the overall thickness can be reduced.
Note that there is Non-Patent Document 1 as a document related to the chucking.

Itao Kiyoshi "Precision Engineering Account 5 Precision Machine Element (2)" Corona, October 20, 1987, p. 27-32

  The disk device has a disk chucking system as described above. In such disk chucking, the disk medium is not mounted properly at a predetermined position on the turntable of the spindle motor. There is always a risk that a phenomenon of so-called mischucking, which is supported and fixed in a state in which it has become, occurs. FIG. 8 is a diagram showing a mischucking occurrence state in the mechanical chucking method. The disk medium 5 is caught by the taper portion of the spindle motor 11 and is sandwiched between the disk clamper 23 in an oblique state. FIG. 10 is a diagram showing a state in which mischucking has occurred in the magnet chucking method. The disk clamper component 51 attached to the disk medium 50 is also caught by the tip of the positioning shaft of the spindle motor 55 and cannot move due to the attractive force of the magnet 56 on the spindle motor 55.

  If the disk device is started in such a mischucking state, not only damage to the disk medium itself but also actuator parts mounted on the head portion of the disk device may be damaged. . If the disk medium, actuator parts, etc. are damaged, the information recording and reproducing functions as the disk device cannot be fully satisfied.

  In the present invention, by preventing the occurrence of mischucking of such a disk medium, the disk medium is prevented from being damaged, and the actuator parts and the like in the disk apparatus are protected, and information recording and reproducing performance as the disk apparatus is achieved. The purpose of this is to improve the reliability.

  A disk apparatus according to the present invention includes a spindle motor which is a means for mounting and rotating a disk medium at a predetermined position, a driving means for the spindle motor, a rotation direction detecting means for detecting the direction of rotation of the spindle motor, and the spindle. A control device comprising a rotation direction switching means for switching the direction of rotation of the motor, a rotation speed detection means for detecting the rotation state of the spindle motor, and a control means for controlling the respective means, The control means drives the spindle motor to rotate at least once alternately in the forward and reverse directions when the disk medium is transported to the spindle motor mounting position, and then performs normal rotation. Drive control is performed so as to start driving at a desired rotational speed in the direction.

  As described above, the rotation control as described above is performed, and the disk medium is swung via the spindle motor when the disk medium is loaded, thereby preventing the occurrence of mischucking of the disk medium to the spindle motor. It is something that can be done. As a result, damage and destruction of the head and actuator parts in the disk medium and the disk device can be prevented, and the reliability of information recording and reproducing performance as the disk device can be improved.

  The disk device according to the present invention prevents the occurrence of mischucking of a disk medium, and can improve the reliability of the information recording and reproducing performance of the disk device.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a mechanism and system configuration of a disk device in a first embodiment of the present invention, and FIGS. 2 and 3 are flowcharts showing an operation sequence in the first embodiment of the present invention.
Reference numeral 101 shown in FIG. 1 denotes a housing of the head unit of the disk device. The laser 4 incorporated in the holder 107 and the laser light from the laser 4 are divided or focused in the housing 101. , Optical elements 15, 16, 17, 18 for changing the direction, the objective lens 12, the actuator 102 for driving the objective lens 12, and the laser beam reflected from the disk 5 which is a recording / reproducing medium The detector 2 and the detector 3 attached to the holder 106 for receiving light are respectively adjusted in position and attached by fixing means such as an adhesive or screwing.

  A flexible printed circuit board (hereinafter referred to as FPC) 105 is attached to the laser 4 as a transmission means for transmitting / receiving a laser drive control signal and the like to / from an external circuit. The laser 4 is disposed on the FPC 105 wiring pattern. A laser driver 6 and electric circuit parts 7, 8, 9, and 10 for driving are arranged.

  Similarly, the detectors 2 and 3 and the actuator 102 are attached by using a fixing means such as soldering via a wiring pattern applied to the FPC 104 for signal transmission to an external circuit.

  A driving force transmission means 110 having an engaging rack 13 is fixed to the optical pickup casing 101, and is a driving motor for the head portion, which is attached to a chassis (not shown). The drive lead screw 19 connected to the stepping motor 20 is engaged. The driving force transmission means 110 is an elastic body, and not only transmits the driving force of the stepping motor to the head portion but also has a function of applying a preload to the engagement between the rack 13 and the lead screw 19. Such a structure makes it possible to operate along the shafts 21 and 22 (mounted on the chassis) for guiding the casing 101 of the head portion, and thereby, in the radial direction of the disk 5 from the inner periphery. It is possible to control the reciprocating motion over the outer periphery.

  The disk medium 5 is chucked on a turntable on the spindle motor 11 by a disk clamper component 23, and can be rotated in this chucked state.

  The spindle motor 11 is driven by motor drive means 31, and the motor drive means 31 is configured to be controlled by instructions from the control means 30. The control means 30 is configured to control the timer 35 while controlling the motor driving means 31.

  In addition, the information about the rotation state such as the rotation direction and the rotation speed of the spindle motor 11 can be successively known by the motor driving means 31, the rotation direction detecting means 32, and the rotation speed detecting means 34 for measuring the rotation speed. It has become. Further, the rotation direction of the spindle motor 11 can be appropriately switched by the rotation direction switching means 33 and the motor driving means 31.

  The spindle motor control operation during disk chucking in the first embodiment of the present invention will be described with reference to the flowchart of FIG.

  This spindle motor control operation starts when the disk device system detects (201) the disk loading operation. When the disc loading operation is detected, the control means 30 first resets the timer 35 and then starts counting (202). After the timer 35 is started, the control means 30 starts the spindle motor 11 to rotate in the normal rotation direction (forward direction) as a system with the motor driving means 31 (203), and is set in the timer 35. The spindle motor 11 is kept rotating for a certain time (204). When the timer 35 exceeds the set time, the rotation of the spindle motor 11 is stopped (205).

  After instructing the motor driving means 31 to stop the rotation of the spindle motor 11, the control means 30 resets the timer 35 again and starts again (206). After the timer 35 is started again, the control means 30 starts the spindle motor 11 to rotate in the direction opposite to the previous rotation direction by the motor driving means 31 (207). At this time, the spindle motor 11 is continuously rotated in the reverse direction during the time set in the timer 35 (208), and when the timer 35 exceeds the set time, the spindle motor 11 Control is performed to stop the rotation (209). Then, after the series of control operations is completed, the process proceeds to the next system operation sequence.

  Here, the data detected from the rotational speed detecting means 34 is used for determining whether or not the spindle motor 11 is rotating without stopping during the drive control of the spindle motor 11. In other words, if it does not rotate when it should rotate, it is considered that some sort of malfunction has occurred, so by stopping the series of system control operations and generating further alarms, etc. Inform the user of the occurrence.

  As described above, by driving the spindle motor 11, as a result, the disk medium 5 on the spindle motor 11 is swung and given vibration, so that the disk medium 5 and the components on the spindle motor 11 are It is possible to eliminate the catches that occur during the period and prevent a mischucking state.

  In order to further improve the above effects, a control operation as shown in FIG. 3 may be used. The control operation will be described below.

  The spindle motor control operation shown in FIG. 3 repeats the above-described operation of FIG. 2 a desired number of times. That is, when the disk device system detects a disk loading operation (201), the control means 30 first sets n = 1 as a variable indicating the number of operations (210). Thereafter, after the timer 35 is reset, the post-counting is started (202). After the timer 35 is started, the control means 30 starts the spindle motor 11 to rotate in the normal rotation direction (forward direction) as the system with the motor driving means 31 (203). The spindle motor 11 is kept rotating for a certain time (204). When the timer 35 exceeds the set time, the rotation of the spindle motor 11 is stopped (205).

  After instructing the motor driving means 31 to stop the rotation of the spindle motor 11, the control means 30 resets the timer 35 again and starts again (206). After the timer 35 is started again, the control means 30 starts the spindle motor 11 to rotate in the direction opposite to the previous rotation direction by the motor driving means 31 (207). At this time, the spindle motor 11 is continuously rotated in the reverse direction during the time set in the timer 35 (208), and when the timer 35 exceeds the set time, the spindle motor 11 Control is performed to stop the rotation (209). After instructing the motor drive means 31 to stop the rotation of the spindle motor 11, the control means 30 determines whether or not the series of operation times n exceeds m times set as a desired number of repetitions. (211).

  Then, until reaching the set number m, the above-described series of control operations is repeated again with the operation variable n plus 1 as the value of the next operation variable (212). When it is determined that the number of operations n is equal to or greater than the set number m, it is determined that a series of control operations at the time of chucking has been completed, and the process proceeds to the next system operation sequence. .

  When m = 1 is set in this control operation, the same result as the control operation shown in FIG. 2 is obtained.

  2 and 3, the spindle motor 11 is first rotated in a normal direction (forward direction) in the system and then reversely rotated. However, the initial rotation direction is the normal direction (forward direction). Of course, it may be from the opposite direction.

  As described above, by rotating the spindle motor 11 in the forward and reverse directions many times, the number of times the disk medium 5 is swung is increased, and as a result, the probability of a mischucking state is further reduced. It is something that can be done.

Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 4 is a diagram showing the mechanism and system configuration of the disk device in the second embodiment of the present invention, and FIGS. 5 and 6 are flowcharts showing the operation sequence in the second embodiment of the present invention.

  In the system of the first embodiment, the timer 35 is used, but in the second embodiment, the same effect can be obtained without using the timer 35. That is, as shown in FIG. 4, in this embodiment, the spindle motor 11 is driven by motor driving means 31, and the motor driving means 31 is controlled by an instruction from the control means 30, Information regarding the rotation state such as the rotation direction and the rotation speed of the spindle motor 11 can be sequentially known by the motor drive unit 31, the rotation direction detection unit 32, and the rotation number detection unit 34. Further, the rotation direction switching means 33 and the motor driving means 31 can appropriately switch the rotation direction of the spindle motor 11.

The spindle motor control operation at the time of disk chucking in the second embodiment will be described using the flowchart of FIG.
This spindle motor control operation is started when the disk device system detects (501) the disk loading operation, as in the first embodiment. When the disc loading operation is detected, the control means 30 activates the spindle motor 11 to rotate in the normal rotation direction (forward direction) as a system by the motor driving means 31 (502). Then, the number x of rotation of the spindle motor 11 is detected from the number-of-rotations detecting means 34 (503). Then, the control means 30 determines whether or not the detected rotation number x of the spindle motor 11 has rotated more than a variable y set as a desired spindle motor rotation number (504). If the spindle motor 11 does not rotate more than y times which is the desired number of rotations, the rotation drive is continued as it is, and if it rotates more than y times, the rotation of the spindle motor 11 is stopped. (505).

  After instructing the motor driving means 31 to stop the rotation of the spindle motor 11, the control means 30 activates the spindle motor 11 to rotate in the direction opposite to the previous rotation direction (506). ). Also at this time, the number of rotations x of the spindle motor 11 is detected from the number-of-rotations detection means 34 (507), and whether the detected number of rotations x has exceeded the variable y set as the desired number of spindle motor rotations. (508), if the spindle motor 11 does not rotate more than y times which is the desired number of rotations, the rotation drive is continued as it is. If the spindle motor 11 rotates more than y times, the spindle motor 11 is rotated. Control is performed to stop (509). Then, after the series of control operations is completed, the process proceeds to the next system operation sequence.

  Here again, as in the first embodiment, the data detected by the rotation speed detecting means 34 is also used for determining whether or not the rotation is rotating without stopping. Determines that some trouble has occurred, stops a series of system control operations, and generates an alarm to notify the user of the occurrence of an abnormality in the system.

Further, the number of rotations y set here may be 1 or less. That is, a setting such as a half rotation or a quarter rotation may be used.
As described above, by driving the spindle motor 11, as a result, the disk medium 5 on the spindle motor 11 is swung and given vibration, so that the disk medium 5 and the components on the spindle motor 11 are It is possible to eliminate the catches that occur during the period and prevent a mischucking state. In order to further improve the effect, an operation flow as shown in FIG. 6 may be used.

  The spindle motor control operation shown in FIG. 6 repeats the above-described operation of FIG. 5 a desired number of times. That is, when a disc loading operation is detected (501), the control means 30 first sets n = 1 as a variable indicating the number of operations (510). Thereafter, the control means 30 is activated by the motor driving means 31 so as to rotate the spindle motor 11 as a system in the normal rotation direction (forward direction) (502). Then, the number x of rotation of the spindle motor 11 is detected from the number-of-rotations detecting means 34 (503). Then, the control means 30 determines whether or not the detected rotation number x of the spindle motor 11 has rotated more than a variable y set as a desired spindle motor rotation number (504). If the spindle motor 11 does not rotate more than y times which is the desired number of rotations, the rotation drive is continued as it is, and if it rotates more than y times, the rotation of the spindle motor 11 is stopped. (505). The number of rotations y set here may be set to 1 or less as in the operation of FIG. 5, that is, a half rotation or a quarter rotation.

  After instructing the motor driving means 31 to stop the rotation of the spindle motor 11, the control means 30 activates the spindle motor 11 to rotate in the direction opposite to the previous rotation direction (506). ). Also at this time, the number of rotations x of the spindle motor 11 is detected from the number-of-rotations detection means 34 (507), and whether the detected number of rotations x has exceeded the variable y set as the desired number of spindle motor rotations. (508), if the spindle motor 11 does not rotate more than y times which is the desired number of rotations, the rotation drive is continued as it is. If the spindle motor 11 rotates more than y times, the spindle motor 11 is rotated. Control is performed to stop (509). After instructing the motor drive means 31 to stop the rotation of the spindle motor 11, the control means 30 determines whether or not the series of operation times n exceeds m times set as a desired number of repetitions. (511). Then, until the operation number n reaches the set number m, the above-described series of control operations is repeated again with the value obtained by adding 1 to the operation variable n as the value of the next operation variable (512). If it is determined that the number of operations n has reached the set number m or more, it is determined that a series of control operations at the time of chucking has been completed, and the process proceeds to the next system operation sequence. .

  When m = 1 is set in this control operation, the same result as the control operation shown in FIG. 5 is obtained. 5 and FIG. 6, the spindle motor 11 is first rotated in the normal direction (forward direction) in the system and then reversely rotated. However, the initial rotation direction is the normal direction (forward direction). The direction may be opposite to the direction.

  As described above, by rotating the spindle motor 11 in the forward and reverse directions many times, the number of times the disk medium 5 is swung is increased, and as a result, the probability of a mischucking state is further reduced. Can do.

Overall configuration schematic diagram of the first embodiment of the present invention Control operation flowchart of the first embodiment of the present invention Control operation flowchart of the first embodiment of the present invention Overall configuration schematic diagram of the second embodiment of the present invention Control operation flowchart of the second embodiment of the present invention Control operation flowchart of the second embodiment of the present invention Chucking state diagram with mechanical chucking method Mischucking state diagram with mechanical chucking method Chucking state diagram with magnet chucking method Mischucking state diagram with magnet chucking method

Explanation of symbols

5 ... Disc medium, 11 ... Spindle motor, 23 ... Disc clamper,
30 ... Control means, 31 ... Motor drive means, 32 ... Rotation direction detection means,
33 ... Rotation direction switching means, 34 ... Number of rotation detection means, 35 ... Timer,

Claims (3)

In a disk device having a head part which is means for recording or reproducing information on a disk medium,
A spindle motor which is a means for mounting and rotating a disk medium at a predetermined position;
Drive means for driving the spindle motor;
Rotation direction detecting means for detecting the rotation direction of the spindle motor;
Rotation direction switching means for switching the rotation direction of the spindle motor;
A rotational speed detection means for detecting the rotational state of the spindle motor;
Consists of control means for controlling the above means,
The control device drives the spindle motor alternately at least once in the forward and reverse directions when the disk medium is transported to the spindle motor mounting position. 2. The disk apparatus according to claim 1, wherein the spindle motor is driven to rotate in the forward and reverse directions alternately at least once and a predetermined number of times. In a disk device having a head part which is means for recording or reproducing information on a disk medium,
A spindle motor which is a means for mounting and rotating a disk medium at a predetermined position;
Drive means for driving the spindle motor;
Rotation direction detecting means for detecting the rotation direction of the spindle motor;
Rotation direction switching means for switching the rotation direction of the spindle motor;
A rotational speed detection means for detecting the rotational state of the spindle motor;
A timer for managing the driving time of the spindle motor;
Consists of control means for controlling the above means,
The control means drives the spindle motor alternately in the normal rotation direction and the reverse rotation direction at least once during a specified time when the disk medium is transported to the spindle motor mounting position. Disk unit to be used.

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