JP4808121B2 - Disk unit - Google Patents

Description

  The present invention relates to a disk device including a rotation drive unit that rotates a disk and a head that moves along the disk.

  In a disk device that drives a CD (compact disk), a DVD (digital versatile disk), or the like, the disk is clamped to the turntable and is rotationally driven together with the turntable. A head for reading information recorded on the disk or recording information on the disk is moved along the disk by the power of the motor.

  As a thread mechanism that converts the power of the motor into the moving force of the head, a screw shaft extending along the moving direction of the head is provided, and the head is provided with a hooking portion that hooks into a groove of the screw shaft, Some have the head move with the rotation of the screw shaft.

  Patent Documents 1 and 2 below disclose a thread mechanism that moves a head using a pinion gear and a rack. In this thread mechanism, a rack member is provided on the head, and a pinion gear that is rotationally driven by a motor meshes with the rack member, so that rotation of the motor is converted into linear movement of the head.

Further, the rack member is configured by overlapping a fixed side rack and a movable side rack, and the movable side rack is biased by a spring. Since the teeth of the pinion gear are sandwiched between the teeth of the fixed rack and the teeth of the movable rack, the occurrence of meshing backlash between the rack member and the pinion gear is suppressed.
Japanese Patent Laid-Open No. 2001-6302 JP 2002-25206 A

  As described in Patent Document 1 or Patent Document 2, in a sled mechanism in which a rack member is provided on a head, both a fixed rack and a movable rack that constitute the rack member are meshed with a pinion gear. In order to reliably mesh the two stacked racks and the pinion gear, it is necessary to use a pinion gear having a large axial thickness dimension. For this reason, the thickness of the thread mechanism increases, making it difficult to construct a thin device.

  The present invention solves the above-described conventional problems, and provides a disk device that can surely mesh a pinion gear and a rack member even when a thin pinion gear is used, and can be configured to be thin. The purpose is that.

The present invention provides a rotational drive unit that rotates a disk, a head that performs at least one of a recording operation and a reproduction operation facing the disk, a guide unit that guides the head along the surface of the disk, and the head In the disk device provided with a transfer mechanism that moves along the guide part,
The transfer mechanism has a pinion gear that is rotationally driven by the power of a motor, and the head has a holding plate whose surface extends in the moving direction of the head, and a rack member in which teeth are arranged along the moving direction of the head. And is provided,
The holding plate is provided so as to be movable in the moving direction within a gap between the pinion gear and a support portion that supports the pinion gear shaft, and the rack member meshes with the pinion gear. It is what.

  In the disk device of the present invention, the rack member is engaged with the pinion gear while the holding plate provided on the head is sandwiched between the pinion gear and the support portion. Therefore, the rack member provided on the holding plate does not easily move in the axial direction of the pinion gear, and the rack member does not easily come off the pinion gear. Therefore, the axial dimension of the pinion gear can be made as small as possible, and the mechanism can be made thin.

  In the following embodiment, a pinion gear is provided on the rotation shaft of the motor, and a gap between the pinion gear and the motor body, a gap between the pinion gear and the holding metal fitting provided on the motor body, A holding plate is provided. That is, the motor main body and the holding metal fitting are the support portions. However, the respective shafts of the pinion gear and the gear train that transmits power to the pinion gear are fixed to the support portion, and the power of the motor is transmitted to the pinion gear through the gear train. The plate may be sandwiched between the pinion gear and the support portion.

In the present invention, the rack member includes a fixed-side rack that moves integrally with the head, and a movable-side rack that can move in a tooth arrangement direction with respect to the head. A biasing member for biasing in the direction of the
It is preferable that the pinion gear meshes with both the fixed side rack and the movable side rack in a state where the teeth of the pinion gear are sandwiched between the teeth of the fixed side rack and the teeth of the movable side rack. .

  With the above configuration, it is possible to suppress backlash of meshing between the rack member and the pinion gear.

  Further, the present invention can be configured such that the holding plate and the fixed rack are fixed to the head, and the movable rack is movably sandwiched between the holding plate and the fixed rack. . If the movable rack is sandwiched between the holding plate and the fixed rack, the entire structure can be made thinner.

  In the present invention, the fixed rack is separated from the holding plate by providing a plurality of latching portions that are latched so that a part of the holding plate and a part of the fixed rack are not separated from each other. This makes it easier to prevent the fixed rack from coming off the pinion gear.

  In addition, a spacer portion is projected from one of the holding plate or the fixed side rack at a portion where the latching portion is not provided, and this spacer portion is abutted against the other, and the holding plate and the If the distance from the fixed rack is maintained, a sufficient gap can be secured between the holding plate and the fixed rack so that the movable rack can move.

  Furthermore, in the present invention, it is preferable that one of the holding plate and the fixed rack is formed of a metal plate, and a plate spring constituting the urging member is formed on a part of the metal plate.

  As described above, by integrally forming the leaf springs on the holding plate or the fixed side rack, it is possible to reduce the number of parts and further reduce the thickness of the mechanism.

  In the disk device of the present invention, the rack member is difficult to come off from the pinion gear. Therefore, a pinion gear having a small axial thickness can be used, and the mechanism can be thinned.

  FIG. 1 is a bottom view showing a mechanism unit provided in a disk device according to an embodiment of the present invention, with a bottom surface facing the front side of the paper, and FIG. 2 is a portion showing a part of the mechanism unit with the bottom surface facing up. FIG. 3 is an exploded perspective view, FIG. 3 is a partial bottom view showing a part of the mechanism unit with the bottom surface facing the front side of the paper, and FIG. 4 is an enlarged bottom view showing the moving mechanism which is a part of FIG.

  In each figure, the X1 direction shown is the right direction, the X2 direction is the left direction, the Y1 direction is the front, the Y2 direction is the rear, the Z1 direction is the upward direction, and the Z2 direction is the downward direction.

  The disk device 1 can be loaded with a disk such as a CD (compact disk) or a DVD (digital versatile disk). The disk device 1 has a housing (not shown) that is thinner than the 1DIN size of in-vehicle equipment. A nose portion (not shown) having a liquid crystal display panel and various switches is provided on the front surface of the housing, and a slit-like insertion opening extending in the width direction (X direction) is provided in the nose portion.

  In the disk device 1, a mechanism unit 2 shown in FIG. The mechanism unit 2 includes a bottom chassis 10 that is directed toward the front side of the sheet of FIG. 1 and a top chassis 11 that is opposed to the top of the bottom chassis 10 with a space therebetween (in the Z1 direction). . The four corners of the bottom chassis 10 or the top chassis 11 are attached to the inside of the housing via the damper 70, and external vibrations acting on the housing when reading from the disk D are performed. The influence on the reading operation can be reduced.

  A drive base 8 is provided on the bottom chassis 10, and a clamp arm is supported on the top chassis 11. The drive base 8 is provided with a rotation drive unit 4. In the rotation drive unit 4, a spindle motor 5 is fixed to the drive base 8, and a turntable is fixed to a rotation shaft that protrudes in the Z <b> 1 direction of the spindle motor 5. A clamper facing the turntable is rotatably supported by the clamp arm.

  As shown in FIG. 1, the bottom chassis 10 is provided with two conveying rollers (conveying means) 6A and 6B. The top chassis 11 is provided with a sliding member made of a synthetic resin that sandwiches the disk D between the transport rollers 6A and 6B.

  A pair of detection pins 26 and 26 are provided on the top chassis 11 so as to be movable so that they can approach or move away from each other. Further, the detection pins 26 and 26 are urged in a direction approaching each other.

  As shown in FIG. 1, left side slider 3 </ b> A and right side slider 3 </ b> B are slidably supported in the Y <b> 1-Y <b> 2 directions on the bent side portions that are bent on both side portions of top chassis 11. A driving member 20 is provided on the bottom chassis 10. When the drive member 20 is rotated clockwise by the power of the switching motor M1, the left slider 3A is moved in the Y1 direction. Further, the power of the driving member 20 acts on the right slider 3B via the slider link 31 and the reverse link 32, and the right slider 3B is moved in the Y1 direction together with the left slider 3A. The left slider 3A and the right slider 3B are provided with a lifting cam for lifting the clamp arm and a cam for retracting the transport rollers 6A and 6B downward.

  FIG. 1 shows a disk insertion standby state in which the clamp arm is lifted and the clamper is separated from the turntable. Further, the conveying rollers 6A and 6B are pressed against the sliding member by a spring force.

  The disk D is inserted from the insertion port, and the distance between the detection pin 26 and the detection pin 26 is widened by the disk D. When this is detected, the transport rollers 6A and 6B are started, and the disk D slides with the transport rollers 6A and 6B. The disc D is fed into the mechanism unit 2 by the rotational force of the transport rollers 6A and 6B. When it is detected that the disk D is fed until the center hole of the disk D coincides with the center of the turntable, the switching motor M1 is started, and both the left side slider 3A and the right side slider 3B are moved in the Y1 direction. It is done.

  Then, lifting of the clamp arm is released by the lifting cams provided on the left side slider 3A and the right side slider 3B, the clamper is biased toward the turntable by the force of the spring, and the disk D is moved between the turntable and the clamper. And clamped between. Further, the conveying rollers 6A and 6B are lowered to positions away from the disk D by cams provided on the left side slider 3A and the right side slider 3B. Then, the disk D is rotationally driven by the spindle motor 5.

  The drive base 8 is provided with a head 18 that moves along the disk D that is rotationally driven, and a moving mechanism 40 that moves the head 18.

  The drive base 8 is formed of a sheet metal material or the like. As shown in FIGS. 1 to 3, in the rotation drive unit 4, a motor fixing plate 8 a is formed integrally with the drive base 8, and the spindle motor 5 is fixed to the upper surface (Z1 side surface) of the motor fixing plate 8 a. Has been.

  The drive base 8 is provided with a pair of guide shafts 16a and 16b that constitute a guide portion. The guide shafts 16a and 16b are round bars formed of stainless steel or the like. Both ends of the guide shaft 16a and both ends of the guide shaft 16b are fixed to the drive base 8, respectively. The guide shaft 16a and the guide shaft 16b are attached with their positions adjusted so as to be parallel to each other.

  The head 18 has a head base 17. The head base 17 is made of a light metal material such as an aluminum alloy. On one side of the head base 17, a bearing portion 17a serving as a movement reference is integrally formed. A round hole is formed through the bearing portion 17a, and a guide shaft 16a is inserted into the round hole. A bearing portion 17b having a U-shaped groove is formed on the other side portion of the head base 17, and the guide shaft 16b is sandwiched in the U-shaped groove. Therefore, the head base 17 is movable in the PQ direction along the guide shafts 16a and 16b with the one guide shaft 16a as a reference.

  In the head base 17, a light emitting element such as a semiconductor laser, an objective lens that gives light emitted from the light emitting element to the recording surface of the disk, a light receiving element that receives reflected light reflected from the recording surface of the disk, and the like. Is built-in.

  In the drive base 8, a transfer motor M2 is provided at a position aligned with the guide shaft 16a. The transfer motor M2 is a stepping motor whose thickness dimension in the Z1-Z2 direction is thin. The surface on the Z2 side of the transfer motor M2 is fixed to the holding metal fitting 52, and both side portions of the holding metal fitting 52 are fixed to the drive base 8. The rotation shaft 51a of the transfer motor M2 protrudes from the hole formed in the holding metal fitting 52 in the Z2 direction, and the pinion gear 51 is fixed to the rotation shaft 51a on the Z2 side of the holding metal fitting 52.

  In the transfer mechanism 40, the holding plate 41 and the fixed side rack 43 are fixed to the same side portion where the bearing portion 17 a of the head base 17 is formed. As shown in FIGS. 2 and 3, the holding plate 41 is formed of a metal plate that can also function as a leaf spring, such as a thin phosphor bronze plate or a stainless steel plate. The fixed rack 43 is also formed of a thin metal plate equivalent to the holding plate 41.

  A mounting piece 41 b protrudes from the holding plate 41, and a mounting piece 43 b having the same shape as the mounting piece 41 b is also formed in the fixed rack 43. As shown in FIG. 2, the mounting piece 43b of the fixed rack 43 is provided with a pair of positioning holes 43b1 and 43b1 and a mounting hole 43b2 formed between the positioning holes 43b1 and 43b1. Similarly, a pair of positioning holes and one mounting hole are formed in the mounting piece 41b formed in the holding plate 41. A pair of positioning protrusions 17c and 17c protrude and are integrally formed on the mounting surface facing the Z2 side of the head base 17, and a female screw hole is formed between the positioning protrusions 17c and 17c.

  A mounting piece 41b formed on the holding plate 41 is installed on the mounting surface of the head base 17. At this time, the positioning projection 17c is inserted into a pair of positioning holes formed in the mounting piece 41b, and the holding plate 41 is moved to the head base. 17 position. The mounting piece 43b formed on the fixed side rack 43 is stacked on the mounting piece 41b so as to be in close contact with each other. Is inserted. As a result, the fixed side rack 43 is positioned on the head base 17. Then, the attachment screw 19 shown in FIG. 3 is inserted into the attachment hole 43b2 formed in the attachment piece 43b and the attachment hole formed in the attachment piece 41b. When the mounting screw 19 is tightened in the female screw hole formed in the head base 17, the holding plate 41 and the fixed side rack 43 are positioned and fixed together.

  As shown in FIG. 2, the holding plate 41 is provided with a flat holding sliding portion 41a, and the holding plate 41 is bent so that a step is formed between the holding sliding portion 41a and the mounting piece 41b. It has been. A flat surface 43d is also formed on the fixed rack 43, and the fixed rack 43 is bent so that a step is formed between the flat surface 43d and the mounting piece 43b. As described above, when the mounting piece 41 b formed on the holding plate 41 and the mounting piece 43 b formed on the stationary rack 43 are in close contact and fixed to the head base 17, the holding sliding portion of the holding plate 41. 41a and the flat surface 43d of the fixed side rack 43 face each other with a space therebetween and in parallel with each other.

  An end portion 41 a 1 of the holding sliding portion 41 a formed on the holding plate 41 extends linearly in the PQ direction that is the moving direction of the head 18. And this edge part 41a1 is inserted in the clearance gap between the pinion gear 51 and the surface of the holding | maintenance metal fitting 52 which is a support part, and the holding | maintenance sliding part 41a is the state piled up with the pinion gear 51, P It can move back and forth in the -Q direction.

  The holding plate 41 is integrally formed with a leaf spring 41c that functions as an urging member. The leaf spring 41c has an elastic arm 41c1. The elastic arm 41c1 has a base end on the Q side bent at a right angle from the holding sliding portion 41a and extends in the PQ direction, and the P side is a free end. The elastic arm 41c1 is provided with an urging portion 41c2 that is bent in a U shape at the end on the P side.

  A movable side rack 42 is provided between the holding sliding portion 41 a of the holding plate 41 and the flat surface 43 d of the fixed side rack 43. The movable rack 42 is made of a synthetic resin material, and sliding protrusions 42b and 42b are integrally formed on the upper surface thereof. The fixed side rack 43 is formed with a pair of restriction elongated holes 43c and 43c extending vertically in the PQ direction. The sliding protrusions 42b and 42b are slidably inserted into the restriction long holes 43c and 43c. In the restriction long holes 43c and 43c, the sliding protrusions 42b and 42b can be slid only in the PQ direction, and are restricted so as not to move in the direction orthogonal to the direction. Therefore, the movable rack 42 can slide only in the PQ direction between the holding plate 41 and the fixed rack 43.

  A pressure-receiving portion 42d is formed on one edge of the movable rack 42, and a biasing portion 41c2 provided at the tip of the elastic arm 41c1 of the leaf spring 41c presses the pressure-receiving portion 42d. Has been. Therefore, the movable rack 42 is always biased in the Q direction. Rack teeth 43a aligned in the PQ direction are formed in the fixed rack 43, and rack teeth 42a aligned in the PQ direction are also formed in the movable rack 42. In a state where the movable rack 42 is positioned on the fixed rack 43, the rack teeth 43a and the rack teeth 42a are arranged side by side. As shown in FIG. 4, when the pinion gear 51 is not meshed with the rack teeth 42a and the rack teeth 43a, the movable rack 42 urged by the leaf spring 41c moves in the Q direction, and the rack teeth 42a. Is displaced so as to be located slightly on the Q side from the rack teeth 43a.

  When the rack teeth 42a and the rack teeth 43a mesh with the teeth of the pinion gear 51, the teeth of the pinion gear 51 are sandwiched between the rack teeth 42a and the rack teeth 43a, and the backlash due to the meshing is substantially removed.

  At the end of the holding slide 41 on the Q side of the holding sliding portion 41a, a hooking piece 41d1 bent so as to rise in the Z2 direction is integrally formed, and at the end of the holding sliding portion 41a on the P side. Also, the latching piece 41d2 bent so as to rise in the Z2 direction is integrally formed. In the fixed rack 43, a support piece 43d1 is formed at the end of the flat surface 43d on the Q side, and a support piece 43d2 is formed at the end of the flat surface 43d on the P side. As shown in FIGS. 3 and 4, the respective latching pieces 41 d 1 and 41 d 2 formed on the holding plate 41 are hooked on the support pieces 43 d 1 and 43 d 2 of the fixed side rack 43, and the rack of the fixed side rack 43 is The teeth 43a are restricted from being too far away from the holding sliding portion 41a of the holding plate 41 in the Z2 direction.

  On the flat surface 43d of the fixed side rack 43, a spacer piece 43f bent downward is formed. The spacer piece 43 f is pressed onto the upper surface of the holding sliding portion 41 a of the holding plate 41 through the escape hole 42 c formed in the movable rack 42. This restricts the interval between the holding plate 41 and the fixed rack 43 from being narrowed.

  Therefore, the movable side rack 42 can move between the holding plate 41 and the fixed side rack 43 in the PQ direction with a small resistance, and the rack teeth 42a of the movable side rack 42 and the rack of the fixed side rack 43 are further provided. The teeth 43a are not greatly separated from the holding plate 41 in the Z2 direction.

  In the transfer mechanism 40, when the transfer motor M2 operates and the pinion gear 51 rotates, the rotational force is transmitted from the fixed side rack 43 to the head base 17, and the head 18 moves in the PQ direction. At this time, since the holding sliding portion 41a of the holding plate 41 moves in the PQ direction through the gap between the pinion gear 51 and the holding metal fitting 52, the rack teeth 43a of the fixed side rack 43 move in the Z1-Z2 direction. The movement can be restricted, and the meshing between the rack teeth 43a and the pinion gear 51 can always be compensated. Moreover, since the rack teeth 42a of the movable rack 42 and the rack teeth 43a of the fixed rack 43 are always meshed with the teeth of the pinion gear 51, the meshing backlash between the rack member and the pinion gear 51 is substantially eliminated. it can.

  Further, since the holding sliding portion 41a moves at a position where it overlaps with the pinion gear 51, the rack teeth 42a and the rack teeth 43a are surely engaged with the pinion gear 51, so that the pinion gear 51 has a thickness dimension in the axial direction. The thin pinion gear 51 can be used without making it larger than necessary.

The bottom view which shows the mechanism unit provided in the disc apparatus of the embodiment of the present invention with the bottom face facing the hand bending side of the paper, The partial disassembled perspective view which shows the moving mechanism provided in the mechanism unit and shows the mechanism unit with the bottom side facing upward, Bottom view showing the mechanism unit with the bottom facing the front of the page, Enlarged partial bottom view of the moving mechanism as seen from the bottom

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disk apparatus 2 Mechanism unit 4 Rotation drive part 5 Spindle motor 16a, 16b Guide shaft 17 Head base 18 Head 40 Moving mechanism 41 Holding plate 41c Leaf spring 41d1, 41d2 Hanging piece 42 Movable side rack 42a Rack tooth 43 Fixed side rack 43d1 , 43d2 Support piece 43f Spacer piece 51 Pinion gear 52 Holding bracket M2 Transfer motor

Claims (6)

A rotation drive unit that rotates the disk; a head that performs at least one of a recording operation and a reproduction operation facing the disk; a guide unit that guides the head along the surface of the disk; and the head along the guide unit. In the disk device provided with a transfer mechanism to be moved,
The transfer mechanism has a pinion gear that is rotationally driven by the power of a motor, and the head has a holding plate whose surface extends in the moving direction of the head, and a rack member in which teeth are arranged along the moving direction of the head. And is provided,
The holding plate is provided movably in the moving direction of the head within a gap between the pinion gear and a support portion that supports the pinion gear shaft, and the rack member meshes with the pinion gear. A disk device characterized by the above. The rack member includes a fixed side rack that moves integrally with the head, and a movable side rack that can move in the tooth alignment direction with respect to the head, and the movable side rack moves in the tooth alignment direction. A biasing member for biasing is provided,
The pinion gear meshes with both the fixed side rack and the movable side rack in a state where the teeth of the pinion gear are sandwiched between the teeth of the fixed side rack and the teeth of the movable side rack. The disk device described.   3. The disk device according to claim 2, wherein the holding plate and the fixed side rack are fixed to the head, and the movable side rack is movably sandwiched between the holding plate and the fixed side rack.   4. The disk device according to claim 3, wherein latching portions are provided at a plurality of locations so that a part of the holding plate and a part of the fixed rack are not separated from each other.   In the portion where the latching portion is not provided, a spacer portion protrudes from one of the holding plate or the fixed side rack, and this spacer portion is abutted against the other, and the holding plate and the fixed side The disk device according to claim 4, wherein a distance from the rack is maintained.   6. One of the holding plate and the fixed rack is formed of a metal plate, and a plate spring constituting the urging member is formed on a part of the metal plate. Disk unit.

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