JP2017004578A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device having such a structure that a phenomenon that an optical head starts to resonate along with resonance of a disk when being in an initial position can be suppressed.SOLUTION: A second guide member 45 for guiding an optical head is fixed by fitting to a fixing piece 5b of a driving chassis. Gaps δ1 and δ2 are formed between the second guide member 45 and the fixing piece 5b in an elastic deformation region W1, so that the second guide member 45 is easy to elastically deform in a vertical direction. Therefore, the optical head attempts to resonate but its vibration can be suppressed when a head base 51 of the optical head is located in the elastic deformation region W1. In a fixed region W2, the optical head can be stably moved because the second guide member 45 is firmly fixed to the fixing piece 5b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a disk device that can suppress resonance of an optical head.

  Patent Document 1 describes an invention relating to a moving optical unit guide mechanism of a disk device that employs a structure that prevents resonance of a guide rail.

  The moving optical unit guide mechanism is provided with a fixed side guide rail and a preload side guide rail for guiding the moving optical unit. On the base, rail mounting portions that support both ends of the respective guide rails are fixed.

Both end portions of the fixed side guide rail are abutted against the fixed rail contact surface of the rail mounting portion by plate springs. In the base mounting portion that supports both ends of the preload side guide rail, an elastic body is bonded to the stop surface, and both ends of the preload side guide rail are pressed against the elastic body by a leaf spring.
This structure tries to prevent resonance of the guide rail.

JP-A-8-255441

  In the movable optical unit guide mechanism described in Patent Document 1, both ends of the preload side guide rail are pressed against the elastic body. In this support structure, the preload side guide rail is always elastically supported by the elastic body regardless of the position on the preload side guide rail when the movable optical unit is moving.

  Therefore, the preload side guide rail is always in a state of being easily moved, and even if the guide rail resonance can be suppressed by the elastic body, the preload side guide rail is caused by a relatively low frequency external vibration such as a vehicle body vibration. The rail is easy to swing, and the movable optical unit cannot be guided in a stable state.

  The present invention solves the above-described conventional problems, and only when the optical head is supported at a specific position on the guide member, can the resonance of the optical head be suppressed to follow the vibration of the disk. Accordingly, it is an object of the present invention to provide a disk device that is less likely to cause the optical head to resonate and that can stably guide the optical head.

The present invention relates to a disk device having a chassis, a rotation driving unit provided in the chassis and provided with a disk, and an optical head facing the disk installed in the rotation driving unit.
A first guide member and a second guide member for supporting the optical head movably along the disk;
The both ends of the first guide member are supported by support members provided in the chassis, and the optical head is movably supported between the support members on both sides.
The second guide member is provided with a fixed region fixed to the chassis and an elastic deformation region capable of elastic deformation in a direction perpendicular to the surface of the disk in a guide region for guiding the optical head. It is characterized by this.

  In the disk device of the present invention, when the optical head is supported in the elastic deformation region, the resonance frequency of the optical head determined by conditions including the mass of the optical head and the rigidity of the first guide member is It is closest to the resonance frequency of the disk being driven to rotate.

  In the disk device of the present invention, for example, when the optical head is at an initial position on the center side of the disk, the optical head is supported in the elastic deformation region.

  The disk device of the present invention is particularly effective when the optical head at the initial position is supported by the first guide member at substantially the center position of the support members on both sides.

  In the disk device of the present invention, the second guide member is made of synthetic resin, and a part of the chassis is fitted in a fitting recess extending in the optical head guiding direction. What has the clearance gap formed between a recessed part and both surfaces of the said chassis is preferable.

  In the disk device of the present invention, only a part of the elastic deformation region of the second guide member is elastically deformable, but the second guide member is firmly fixed to the chassis in the other fixing region. Therefore, only when the optical head is located in the elastic deformation region, the second guide member exhibits a vibration suppressing function, and when the optical head is moving in the fixed region, the second guide member causes the optical head to move. Can be guided stably.

  In the present invention, for example, even if the resonance frequency determined by the condition including the mass of the optical head and the rigidity of the first guide member is closest to the resonance frequency of the disk being driven to rotate, It becomes possible to suppress a certain optical head from resonating following the vibration of the disk.

The perspective view which shows the disc apparatus of embodiment of this invention, A plan view showing a mechanism inside the disk device, An exploded perspective view showing an optical head and a guide member; The side view which looked at the 2nd guide member from the IV arrow direction of Drawing 3, Sectional drawing which cut | disconnected FIG. 4 by the VV line,

  In the disk device 1 according to the embodiment of the present invention, the Y1 direction is the carry-in direction, the Y2 direction is the carry-out direction, the X1 direction is the left side, and the X2 direction is the right side. Further, the Z1 direction is upward and the Z2 direction is downward.

  As shown in FIGS. 1 and 2, the disk device 1 has a housing 2. The housing | casing 2 is formed with the metal plate. The casing 2 includes a bottom plate 2a, a front plate 2b facing in the carry-out direction (Y2 direction), a rear plate 2c facing in the carry-in direction (Y1 direction), a left side plate 2d facing the X1 side, and a right side plate 2e facing the X2 side. have. Although the housing | casing 2 has a ceiling board, the ceiling board is shown in the removed state.

  A nose part 3 as a decorative member is fixed to the outside (front) of the front plate 2b, and an insertion / discharge port 4 extending in a slit shape in the left-right direction is opened in the nose part 3. FIG. 2 is shown with the nose portion 3 removed.

  The casing 2 has a so-called 1 DIN volume. When used for in-vehicle use, the casing 2 is installed inside an instrument panel of an automobile, and the nose portion 3 is placed on the panel surface of the instrument panel. appear.

  The disk device 1 is a so-called slot-in type, and as shown in FIG. 1, the disk D is inserted into the housing 2 in a direction along the disk surface from the insertion / discharge port 4.

  As shown in FIGS. 1 and 2, a drive chassis 5 formed of a metal plate is housed inside the housing 2. A plurality of damper members 7 are provided on the bottom plate 2 a of the housing 2, and the drive chassis 5 is supported by the damper members 7 and coil springs so as to be able to move inside the housing 2. The damper member 7 has a fluid such as oil sealed in a rubber flexible case.

  A rotation drive unit 10 is disposed at a substantially central portion inside the housing 2. The rotation drive unit 10 includes a turntable 11 and a clamper 12. A pindle motor is fixed to the lower side of the drive chassis 5, a rotation shaft of the spindle motor extends above the drive chassis 5, and the turntable 11 is fixed to the rotation shaft. A clamp arm 13 is supported on the drive chassis 5 so as to be rotatable about a support portion 13a provided on the Y1 side. The clamper 12 is rotatably supported on the lower side of the tip portion of the clamp arm 13 on the Y2 side. A clamp spring is provided between the drive chassis 5 and the clamp arm 13, and the clamp arm 13 is urged in a direction in which the clamper 12 is pressed against the turntable 11 by the elastic force of the clamp spring.

  As shown in FIG. 2, a drive mechanism 20 is provided inside the housing 2. In the drive mechanism 20, a motor 21 is fixed on the drive chassis 5, and the power of the motor 21 is transmitted to the main drive gear 23 and further transmitted to a gear train 24 having a plurality of gears. These gears are rotatably supported on the drive chassis 5.

  A switching member 6 is supported inside the left side plate 2d of the housing 2 so as to be movable in the Y1-Y2 direction. A clamp release cam 6a is formed at the end of the switching member 6 on the Y1 side. As shown in FIG. 1, when waiting for loading of the disk D, the switching member 6 is moved in the Y1 direction, and the lifting portion 13b formed on the clamp arm 13 is lifted by the clamp release cam 6a. The clamper 12 is separated from the turntable 11 upward.

  As shown in FIG. 2, a loading detection lever 25 is rotatably supported at the back of the housing 2 on the Y1 side. When the center hole Da of the loaded disk D reaches the turntable 11 and the loading detection lever 25 is pushed at the Y1 side edge of the disk D, the loading detection lever 25 is rotated counterclockwise. The switching mechanism 26 is operated by force, the rotational power of the gear train 24 is applied to the switching member 6, and the switching member 6 starts to move in the Y2 direction. At this time, the clamp release cam 6a provided on the switching member 6 is disengaged from the lifting portion 13b, the clamp arm 13 is lowered by the elastic force of the clamp spring, and the center hole Da of the disk D is connected to the turntable 11, the clamper 12, and the like. Clamped between.

  As shown in FIG. 1, inside the housing 2, a transport mechanism 30 is provided between a nose portion 3 having an insertion / discharge port 4 and a rotation drive unit 10.

  The transport mechanism 30 is provided with a roller bracket 31. The roller bracket 31 is formed of a metal plate, and a support fulcrum portion 31a provided at an end portion on the Y2 side is rotatably supported by the drive chassis 5.

  As shown in FIGS. 1 and 2, the left and right ends of the roller shaft 32 are rotatably supported by the roller bracket 31. A pair of transport rollers 33 and 33 are inserted through the outer periphery of the roller shaft 32. The conveyance roller 33 is made of a synthetic rubber material. A synthetic resin disk guide 34 is fixed to a ceiling plate (not shown) of the housing 2, and the conveying roller 33 and the disk guide 34 face each other vertically.

  The roller bracket 31 is always urged by a roller urging spring so that the conveying roller 33 is lifted in the Z1 direction. When the disk D is transported, the roller bracket 31 is pivotally biased upward by the elastic force of the roller biasing spring, and the disk D is sandwiched between the transport roller 33 and the disk guide 34.

  A roller lowering cam 6b is formed at the end of the switching member 6 on the Y2 side. When the switching member 6 moves in the Y2 direction after the disk D is loaded, the roller bracket 31 is moved by the roller lowering cam 6b. Rotated downward, the transport roller 33 moves away from the disk D.

  As shown in FIGS. 1 and 2, a driven gear 35 is fixed to the end of the roller shaft 32 on the X1 side. In the drive mechanism 20 shown in FIG. 2, a roller drive gear 27 is provided at the final stage of the gear train 24 in the Y2 direction. When the roller shaft 32 and the transport roller 33 are lifted by the rotation of the roller bracket 31, the driven gear 35 meshes with the roller drive gear 27, and the roller shaft 32 and the transport roller 33 are rotated by the rotational force of the driven gear 35. It is done.

  As shown in FIGS. 1 and 2, an optical head 50 and a head transfer mechanism 40 that moves the optical head 50 are provided inside the housing 2.

  As shown in FIG. 3, the optical head 50 has a head base 51 made of synthetic resin. The base end portion of the suspension wire 53 is fixed to the head base 51, and the lens holder 52 is supported by the distal end portion of the suspension wire 53. An objective lens 54 is held on the lens holder 52. The head base 51 is equipped with a focus correction mechanism and a tracking correction mechanism, and the lens holder 52 is driven in the focus correction direction and the tracking correction direction. The head base 51 is mounted with various optical components such as a light emitting element that sends detection light to the objective lens 54 and a light receiving element that receives the reflected light reflected by the disk D and captured by the objective lens 54. .

  As shown in FIGS. 2 and 3, the head transfer mechanism 40 is provided with a first guide member 41 and a second guide member 45. The first guide member 41 and the second guide member 45 are supported by the drive chassis 5 shown in FIG. 1, but FIG. 2 is shown with the drive chassis 5 removed.

  The first guide member 41 is a metal guide shaft having a perfectly circular cross section. One end of the first guide member 41 is supported by a first support member 42 fixed to the drive chassis 5, and the other end is also It is supported by a second support member 43 (not shown) fixed to the drive chassis 5. As shown in FIGS. 2 and 3, a first bearing portion 51 a serving as a reference bearing portion is integrally formed on one side portion of the head base 51, and the first bearing portion 51 a serves as the first support. Between the member 42 and the second support member 43, it is slidably inserted outside the first guide member 41.

  The second guide member 45 is made of a synthetic resin material. A fitting recess 46 that opens in the X2 direction is formed in the second guide member 45, and the fitting recess 46 extends in the Y1-Y2 direction. As shown in FIG. 4, the fitting recess 46 has a lower inner wall 46a on the Z2 side and an upper inner wall 46b on the Z1 side.

  As shown in FIG. 4, in the second guide member 45, the guide area for guiding the optical head 50 is divided into an elastic deformation area W1 and a fixed area W2. In the fixed region W2, pinching protrusions 47 projecting in the Z1 direction from the lower inner wall 46a are integrally formed at two locations spaced in the Y direction.

  In the elastic deformation region W1, the upper inner wall 46c of the fitting recess 46 is formed at a position slightly higher on the Z1 side than the upper inner wall 46b of the fixed region W2. A step 46d is formed at the boundary between the upper inner wall 46b of the elastic deformation region W1 and the upper inner wall 46c of the fixed region W2.

  Further, the second guide member 45 is integrally formed with a locking projection 48 that protrudes in the X2 direction below the lower inner wall 46a. The locking protrusions 48 are provided at three places.

  As shown in FIGS. 3 and 5, the drive chassis 5 is provided with a bent piece 5a bent to the Z2 side and a fixed piece 5b bent in the horizontal direction from the lower edge of the bent piece 5a. Yes. At the bending boundary between the bent piece 5a and the fixed piece 5b, retaining holes 5c are formed at three locations.

  As shown in FIGS. 4 and 5, the second guide member 45 is fixed to the drive chassis 5 by the fixing piece 5 b formed in the drive chassis 5 being inserted into the fitting recess 46. In the fixing region W2 shown in FIG. 4, the fixing piece 5b is firmly sandwiched between the upper inner wall 46b and the pinching protrusion 47 inside the fitting recess 46, and the upper surface of the fixing piece 5b is almost the entire area in the Y direction. Is in close contact with the upper inner wall 46b. Therefore, in the fixed region W2, the second guide member 45 is firmly fixed without moving in the Z1-Z2 direction.

  On the other hand, in the elastic deformation region W1, a gap δ1 is formed between the lower surface of the fixed piece 5b and the lower inner wall 46a, and a gap δ2 is formed between the upper surface of the fixed piece 5b and the upper inner wall 46c. In the elastic deformation region W1, the upper and lower portions of the second guide member 45 can be elastically deformed in the Z1-Z2 direction by the gap.

  As shown in FIGS. 3 and 4, a second bearing portion 51b is formed on the other side of the head base 51, and a bearing recess 51c is formed in the second bearing portion 51b. As shown in FIG. 3, a leaf spring member 55 is fixed to the head bail 51. An elastic urging piece 55a is integrally formed at the lower part of the leaf spring member 55, and an urging portion 55b is formed at the tip thereof. As shown in FIGS. 4 and 5, the bearing recess 51 c is mounted on the outer periphery of the second guide member 45, and the urging portion 55 b of the elastic urging piece 55 a is the lower surface 45 a of the second guide member 45. Is slidably repressed. Thus, the second bearing portion 51b is supported by the second guide member 45 so as not to rattle up and down.

  As shown in FIGS. 2 and 3, in the drive mechanism 20, a power transmission member 28 is provided on the drive chassis 5. A bearing portion 28 a is formed integrally with the power transmission member 28, and the bearing portion 28 a is slidably inserted into the first guide member 41. The power transmission member 28 is integrally formed with a rack portion 28b. A pinion gear is integrally formed with the main drive gear 23 shown in FIG. 2, and the pinion gear always meshes with the rack portion 28b.

Next, the operation of the disk device 1 will be described.
As shown in FIG. 1, in the standby mode for waiting for loading of the disk D, the switching member 6 is moved in the Y1 direction, the clamp arm 13 is lifted, and the clamper 12 is separated from the turntable 11 upward. . Further, the roller bracket 31 is lifted by the spring force, and the transport roller 33 is pressed against the lower surface of the disc guide 34.

  When the disk D is inserted from the insertion / discharge port 4 and is detected by an insertion detection member (not shown), the motor 21 of the drive mechanism 20 is started. The rotational force of the motor 21 is transmitted from the main drive gear 23 to the roller drive gear 27 through the gear train 24. A rotational force is transmitted from the roller drive gear 27 to the driven gear 35, and the roller shaft 32 and the transport roller 33 rotate. Therefore, the disk D is sandwiched between the rotating conveyance roller 33 and the disk guide 34 and is carried into the housing 2.

  When the center hole Da of the loaded disk D moves onto the turntable 11, the disk loading detection lever 25 is pushed at the edge of the disk D on the Y1 side and rotates counterclockwise. The switching mechanism 26 is operated by this rotational force, the rotational force of the gear train 24 is transmitted to the switching member 6, and the switching member 6 starts to move in the Y2 direction. When the switching member 6 moves in the Y2 direction from the position shown in FIG. 1, the clamp release cam 6a is disengaged from the lifting portion 13b, the clamp arm 13 is lowered by the force of the clamp spring, and the center hole Da of the disk D is turned into the turntable. 11 and the clamper 12. When the switching member 6 moves in the Y2 direction, the roller bracket 31 is lowered by the roller lowering cam 6b provided on the switching member 6, and the conveying rollers 33 and 33 are separated from the lower surface of the disk D.

  As shown in FIGS. 2 and 3, a power transmission member 28 is movably supported by the first guide member 41. Since the disk 21 is loaded and the loaded disk D is clamped by the turntable 11 and the clamper 12 as described above, the motor 21 continues to rotate, so the main drive gear 23 rotates. Subsequently, the moving force continues to be transmitted to the rack portion 28b of the power transmission member 28 shown in FIGS.

  Here, the power transmission member 28 and the first bearing portion 51a of the optical head 50 are coupled via a coupling spring. As shown in FIG. 1, when power is transmitted from the main drive gear 23 to the rack portion 28b when the optical head 50 moves to the inner peripheral side of the disk D and stops at the initial position, power transmission is performed. The engagement state between the member 28 and the optical head 50 is released, and the power transmission member 28 moves within the loading / discharging drive range L1 shown in FIG. 2 while the connecting spring is elastically deformed. At this time, the optical head 50 remains stopped at the initial position.

  In contrast, when the motor 21 rotates and the main drive gear 23 is driven to rotate after the disc clamping is completed, the power transmission member 28 and the first bearing portion 51a are engaged by the elastic force of the coupling spring. In the head transfer range L2 shown in FIG. 2, the power transmission member 28 and the optical head 50 are integrated and can move in the (a)-(b) direction.

  However, in a normal operation, the motor 21 is stopped immediately after the loaded disk D is clamped on the turntable 11, and the optical head 50 is stopped at the initial position shown in FIG. The spindle motor of the section 10 is rotated to rotate the disk D together with the turntable 11.

  Then, the focus driving mechanism provided in the head base 51 is operated, and the lens holder 52 shown in FIG. 3 is reciprocated at a predetermined frequency in the focus correction direction (Z1-Z2 direction). The recording surface of the inner periphery is irradiated with detection light, and the height position at which the detection light is focused is measured. By this operation, it is determined whether or not a disc that can be reproduced or recorded is loaded on the turntable 11, and further, the type of disc D, for example, CD or DVD, from the in-focus height position. Etc. are determined.

  As shown in FIG. 2, in the disk apparatus 1 according to the embodiment, since it is necessary to provide the loading / discharging drive range L1 on the (a) side of the first guide member 41, the optical head 50 is shown in FIG. When the detection light is irradiated from the objective lens 54 to the recording surface on the inner circumference side of the disk D from the objective lens 54, the first bearing portion 51a includes the first support member 42 and the second support member 42 shown in FIG. The support member 43 is supported by the first guide member 41 at substantially the center position.

The mass of the optical head 50 is M, the length of the first guide member 41 between the first support member 42 and the second support member 43 is L, and the rigidity of the first guide member 41 is E · I. Assuming that E is the longitudinal elastic modulus and I is the sectional moment of inertia, the resonance frequency F of the optical head 50 stopped at the initial position is F = {π / (2 · √3)} · √ {(M - obtained by ^{L 3) / (E · I} )}. In the normal disk device 1, the resonance frequency F is about 520 to 550 Hz.

  However, when the optical head 50 is in the initial position, the driving frequency when the lens holder 52 is driven up and down exists in a band that approximates the resonance frequency F, and a disk having a diameter of 12 cm is driven to rotate. The resonance frequency of the disk D when it is present is in the vicinity of 570 Hz. When the frequencies are approximated in this way, when the rotating disk D resonates, the optical head 50 easily resonates following the resonance. When this phenomenon occurs, the focus error signal becomes an abnormal value, and the focus height position of the detection light cannot be detected.

  Therefore, in this embodiment, when the optical head 50 is stopped at the initial position shown in FIG. 2, as shown in FIG. 4, the second bearing portion 51b of the head base 51 is replaced with the second guide member. It is supported by 45 elastic deformation regions W1. For this reason, when the vibration to resonate the optical head 50 is generated, the second guide member 45 can be elastically deformed up and down due to the presence of the gaps δ1 and δ2 shown in FIG. This elastic deformation exhibits a damping force and can suppress the resonance of the optical head 50.

  On the other hand, in the operation for reproducing information recorded on the disk D or recording information, the optical head 50 moves from the initial position to the outer periphery side of the disk, and the second bearing portion 51b moves to the second guide. The member 45 moves on the fixed region W2. In the fixed region W2, since the fixing piece 5b of the drive chassis 5 is firmly held from above and below by the pinching protrusions 47, 47 formed in the fitting recess 46 of the second guide member 45, the fixed region W2 Thus, the second guide member 45 does not move up and down, and the optical head 50 can be moved stably.

  As described above, in the disk device 1, when the optical head 50 is located at or near the initial position, which is a resonance region that easily oscillates at a frequency closest to the resonance frequency when the disk D is rotated, By supporting the head 50 with the elastic deformation region W1 of the second guide member 45, resonance of the optical head 50 can be suppressed. Further, when the optical head is out of the resonance region, the optical head 50 can be stably guided by the second guide member 45.

DESCRIPTION OF SYMBOLS 1 Disc apparatus 2 Housing | casing 3 Nose part 4 Insertion / discharge port 5 Drive chassis 5b Fixed piece 6 Switching member 10 Rotation drive part 11 Turntable 12 Clamper 20 Drive mechanism 21 Motor 23 Main drive gear 28 Power transmission member 30 Conveyance mechanism 40 Head Transfer mechanism 41 1st guide member 42 1st support member 43 2nd support member 45 2nd guide member 46 Fitting recessed part 46a Lower inner wall 46b Upper inner wall 46c Upper inner wall 47 Clamping protrusion 50 Optical head 51 Head base 51a First bearing portion 51b Second bearing portion D Disk W1 Elastic deformation region W2 Fixed region δ1, δ2 Gap

Claims (5)

In a disk device having a chassis, a rotation drive unit provided in the chassis and on which a disk is installed, and an optical head facing the disk installed in the rotation drive unit,
A first guide member and a second guide member for supporting the optical head movably along the disk;
The both ends of the first guide member are supported by support members provided in the chassis, and the optical head is movably supported between the support members on both sides.
The second guide member is provided with a fixed region fixed to the chassis and an elastic deformation region capable of elastic deformation in a direction perpendicular to the surface of the disk in a guide region for guiding the optical head. A disk device characterized by the above.   When the optical head is supported in the elastic deformation region, the resonance frequency of the optical head determined by conditions including the mass of the optical head and the rigidity of the first guide member is the rotation of the disk being driven to rotate. 2. The disk device according to claim 1, wherein the disk device is closest to the resonance frequency.   3. The disk apparatus according to claim 2, wherein the optical head is supported by the elastic deformation region when the optical head is at an initial position on the center side of the disk.   4. The disk apparatus according to claim 3, wherein the optical head at the initial position is supported by the first guide member at a substantially central position of the support members on both sides.   The second guide member is made of synthetic resin, and a part of the chassis is fitted in a fitting recess extending in the optical head guiding direction. In the elastic deformation region, the fitting recess and both surfaces of the chassis 5. The disk device according to claim 1, wherein a gap is formed between the disk devices.