JP2008210459A - Disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive device which can easily and appropriately engage the feed screw with a nut constituting the pickup moving mechanism without damaging the projecting teeth formed on the nut. <P>SOLUTION: This disk drive device has a feed screw 8 rotatably arranged close to the pickup unit 4, and a nut 9 connected to the fixed position of the pickup unit 4, and the nut 9 has projecting teeth 9a to engage with the spiral groove 8a of the feed screw 8. Positioning pins 12 are formed at least on one of the pickup unit 4 and the nut 9, and positioning holes 14 are formed on the other one to insert the positioning pins 12. The positioning pins 12 have slopes 12b formed inclining to their axes with an acute angle θ which is the same as the lead angle ϕ of the spiral groove 8a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disk drive device that records information on a disk and reads out the recorded information while moving the pickup unit in a radial direction along a disk surface of the disk that is rotationally driven. The present invention relates to a disk drive device capable of appropriately assembling without damaging the components of the mechanism that moves in the radial direction.

  In general, a disk drive device such as a CD player or a DVD recorder includes a turntable for rotating a disk, a pickup unit that can move in the radial direction along a disk surface of the disk supported by the turntable, and the like. Configured.

  According to this type of disk drive device, while rotating the disk supported by the turntable, the pickup unit is moved in the radial direction to record music information or the like on the disk, or to reproduce the recorded information. can do.

  Here, a feed system using a feed screw is generally applied to the mechanism for moving the pickup unit in the radial direction of the disk.

  Specifically, a feed screw (lead screw member) that is rotated by a motor is provided adjacent to a pickup unit that is supported so as to be movable in the radial direction of the disk, and a nut member (guide feed member) is coupled to the pickup unit. The tooth-like protrusion (rack part) formed on the nut member is meshed with a spiral groove formed on the outer periphery of the feed screw (for example, Patent Document 1).

JP 2005-251275 A

  However, according to the pickup moving mechanism using a feed screw, the assembly cannot be performed properly, and components may be damaged during the assembly.

  Specifically, the turntable, the pickup unit, and the moving mechanism thereof are integrally assembled as a drive unit (generally called a traverse mechanism), but the pickup unit combined with the nut member is combined with a feed screw, or the pickup unit assembled first. When the nut member is coupled to the feed screw while being engaged with the nut member, the nut member is pushed in the direction perpendicular to the axis of the feed screw, so that the tooth-shaped protrusion formed on the nut member is against the spiral groove of the feed screw. There is a case where a so-called “caulking phenomenon” is caused by a discrepancy, and the dentate process is lost, or it takes time to repair the product and the productivity is lowered.

  The present invention has been made in view of the above circumstances, and its object is to easily and appropriately engage with a feed screw without damaging the tooth-like projections of the nut member constituting the pickup moving mechanism. It is to be able to do it.

In order to achieve the above object, the present invention
A disk rotating means, a pickup unit 4 that is movable in the radial direction along the surface of the disk that is rotationally driven by the disk rotating means, and a pickup moving mechanism that moves the pickup unit 4 in the radial direction of the disk Have
The pickup moving mechanism has a feed screw 8 that is rotatably provided adjacent to the pickup unit 4 and a nut that is coupled to a fixed position of the pickup unit 4 and converts the rotational movement of the feed screw 8 into a straight movement of the pickup unit 4. Member 9 and
In the disk drive device having a configuration in which the nut member 9 is provided with a tooth-like projection 9a that meshes with the spiral groove 8a of the feed screw 8;
When the nut member 9 is coupled to a fixed position of the pickup unit 4, nut guide means for moving and guiding the nut member 9 along the inclination direction of the spiral groove 8 a between the pickup unit 4 and the feed screw 8 is provided. It is characterized by that.

  Particularly, as the nut guiding means, a positioning pin 12 is provided in at least one of the pickup unit 4 and the nut member 9, and a positioning hole 14 into which the positioning pin 12 is inserted is provided in the other of the pickup unit 4 and the nut member 9. The positioning pin 12 is formed with an inclined surface portion 12b having an acute angle that is the same angle as the lead angle φ of the spiral groove 8a with respect to the axis θ of the positioning pin 12.

  According to the present invention, when the nut member is coupled to the fixed position of the pickup unit, the nut member is moved and guided along the inclination direction (lead angle direction) of the spiral groove of the feed screw between the pickup unit and the feed screw. Since the nut guide means is provided, the nut member can be coupled to the fixed position of the pickup unit while matching the tooth-like projection formed on the nut member with the spiral groove of the feed screw. For this reason, the nut member can be easily and properly engaged with the feed screw without damaging it, and the quality and productivity of the apparatus are improved.

  In particular, as a nut guiding means, a positioning pin is provided in at least one of the pickup unit and the nut member, and a positioning hole into which the positioning pin is to be inserted is provided in the other, so that the nut member is accurately positioned at a fixed position of the pickup unit. In addition, the positioning pin has an inclined surface with an angle that is the same as the lead angle of the spiral groove, and the positioning hole has a positioning hole in the positioning pin without adding new parts. Engagement with the feed screw can be performed easily and appropriately simply by moving the nut member while pressing the edge.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a drive unit constituting a main structure of a disk drive device according to the present invention.

  This drive unit 1 is commonly called a traverse mechanism, and is configured by installing a disk drive motor 3 and a pickup unit 4 on a base chassis 2.

  The base chassis 2 is a fixed plate manufactured by press working or the like, and an opening 2A is formed by cutting out a predetermined area at the center, and the motor 3 and the pickup unit 4 are located inside the opening 2A. Be placed.

  On the other hand, a turntable 5 is fixed to the rotor shaft 3A of the motor 3, and the disk is rotated while the center of the disk (not shown) is supported by the turntable 5.

  The pickup unit 4 reads the recorded information on the disc and writes the information while moving in the radial direction along the surface of the disc rotated while being supported by the turntable 5. This is a light-emitting element such as an objective lens 4b, a laser diode that generates light to be irradiated to the disk surface of the disk through the objective lens 4b, and a light-receiving element that receives reflected light from the disk on a carriage 4a made of a metal plate or the like. It is configured with a device.

  In particular, a pair of left and right guide shafts 6 for guiding the movement of the pickup unit 4 are attached to both sides of the opening 2A of the base chassis 2 so that the pickup unit 4 can move in the radial direction of the disc by the guide shafts 6. It is supported.

  In FIG. 1, reference numeral 7 denotes a motor that generates a driving force for moving the pickup unit 4 along the guide shaft 6 in the radial direction of the disk. Fixed to the chassis 2.

  The disk drive device according to the present invention is configured by incorporating the drive unit 1 as described above in a housing (not shown), and when the disk is inserted into the housing, the central portion of the disk is the turntable 5. Then, the disc is rotated by the activation of the motor 3, and the pickup unit 4 reads and writes information while moving in the radial direction of the disc.

  Next, the pickup moving mechanism will be described with reference to FIGS. 2 and 3. The pickup moving mechanism includes a feed screw 8 that is rotationally driven by the motor 7 and a fixed position of the pickup unit 4 corresponding to the feed screw 8. And a nut member 9 coupled to the.

  The feed screw 8 is rotatably supported in parallel with the guide shaft 6 by a U-shaped bracket 10 fixed to the base chassis 2, and a spiral groove 8a having a predetermined pitch is formed on the outer periphery thereof.

  On the other hand, the nut member 9 is a component that converts the rotational motion of the feed screw 8 into the linear motion of the pickup unit 4, and a tooth-like projection 9 a that meshes with the spiral groove 8 a of the feed screw 8 is formed on this. The nut member 9 is coupled to the side edge of the pickup unit 4 between the pickup unit 4 and the feed screw 8 as shown in FIG. 3, and in this state, the tooth-like projection 9a is connected to the spiral groove 8a of the feed screw 8. It comes to mesh with.

  The configuration of the nut member 9 will be described in detail with reference to FIGS. 4 and 5. The nut member 9 is a small part formed of a synthetic resin or the like, and includes an L-shaped mounting portion coupled to the pickup unit 4. 9b and a sliding contact portion 9c having the above-mentioned tooth-like projection 9a are provided. The sliding contact portion 9c is connected to the attachment portion 9b via a thin resin hinge portion 9d, and a gap G for disposing a spring (not shown) is formed between the attachment portion 9b and the sliding contact portion 9c. . According to this, the sliding contact portion 9c is pressed against the feed screw 8 with a predetermined elasticity, and when the impact is applied from the outside, the sliding contact portion 9c is detached from the feed screw 8 to remove the tooth-like projection 9a. Can be prevented. In this example, two tooth-like projections 9a are formed in parallel at the same interval as the pitch of the spiral groove 8a, but three or more of them may be formed.

  4 and 5, the mounting portion 9b of the nut member 9 is provided with a through hole 11 through which a fixing screw is passed, and two positioning pins 12 are mounted across the through hole 11. It is provided integrally with the part 9b. In particular, the positioning pin 12 is formed with a sloped portion 12b parallel to the tooth trace of the tooth-like projection 9a, leaving an upright portion 12a having a height of about several millimeters at the fixed end (base portion). The diameter of the upright portion 12a is the same as the inner diameter of a positioning hole described later.

  The nut member 9 has a side edge portion of the pickup unit 4 between the pickup unit 4 and the feed screw 8 after the pickup unit 4 and the feed screw 8 are assembled to the base chassis 2 as shown in FIG. And a fixing screw 13.

  FIG. 7 is an enlarged view of a main part showing a state when the nut member 9 is coupled. As is clear from this figure, the pickup unit 4 is formed with the positioning hole 14 corresponding to the positioning pin 12 and the screw hole 15 corresponding to the through hole 11. As is apparent from FIG. 7, the angle θ formed by the inclined surface portion 12b formed on the positioning pin 12 and the axis of the positioning pin 12 is an acute angle, and this angle θ is the lead angle of the spiral groove 8a of the feed screw 8. When the nut member 9 is coupled to the pickup unit 4 in accordance with φ, the inclined surface portion 12b is parallel to the inclination direction (lead angle direction) of the spiral groove 8a between the pickup unit 4 and the feed screw 8. It is like that. Therefore, when the slope portion 12b is pressed against the edge of the positioning hole 14 and the nut member 9 is pushed into the pickup unit 4, the positioning member 12 is inserted into the positioning hole 14 and the nut member 9 spirals along the slope portion 12b. Accordingly, the tooth-like projections 9a formed on the nut member 9 as shown in FIG. 8 have resistance to the inside along the spiral groove 8a without causing a "galling phenomenon". It fits smoothly.

  When the nut member 9 is coupled to the pickup unit 4 as described above, the pickup unit 4 is slid along the guide shaft 6 even if the spiral groove 8a is not located on the extension line of the tooth-like protrusion 9a. Thus, the tooth-like protrusion 9a and the spiral groove 8a can be positioned on the same straight line. Further, after the spiral groove 8a and the tooth-like protrusion 9a are engaged with each other as described above, the fixing screw 13 (see FIG. 6) is inserted into the screw hole 15 formed on the pickup unit 4 side through the through hole 11 of the nut member 9. In addition to being screwed in, the upright portion 12a of the positioning pin 12 fits into the positioning hole 14 without gaps, so that the nut member 9 will not rattle after coupling, and this is securely fixed at a fixed position of the pickup unit 4. be able to.

  Here, in the above example, as the nut guiding means, the positioning hole 14 is provided in the pickup unit 4, while the positioning pin 12 to be inserted into the positioning hole 14 is provided in the nut member 9, and the helical groove 8 a of the positioning pin 12 is provided. Although the inclined surface portion 12b having the angle θ matching the lead angle φ is formed, the present invention is not limited to such a configuration, and the positioning pin 12 is provided in the pickup unit 4 and the corresponding positioning is performed. The hole 14 may be provided in the nut member 9, or the positioning pin 12 and the positioning hole 14 may be provided in both the pickup unit 4 and the nut member 9.

  Such a modification will be described with reference to FIGS. In FIGS. 9 and 10, the same reference numerals are given to portions corresponding to the above example, and detailed description thereof is omitted.

  FIG. 9 is a perspective view of the pickup unit 4 as seen from the back side. As can be seen from this figure, in this example, the pickup unit 4 is provided with two positioning pins 12, on which a slope 12b similar to the above example is formed.

  On the other hand, as shown in FIG. 10, a positioning hole 14 is formed in the attachment portion 9 b of the nut member 9, and the positioning pin 12 can be inserted into the positioning hole 14.

  Also in this example, the angle θ formed by the inclined surface portion 12b formed on the positioning pin 12 and the axis of the positioning pin 12 is an acute angle, and this angle θ matches the lead angle φ of the spiral groove 8a of the feed screw 8. When the nut member 9 is coupled to the pickup unit 4, the inclined surface portion 12 b is parallel to the inclination direction (lead angle direction) of the spiral groove 8 a between the pickup unit 4 and the feed screw 8. Yes. Therefore, when the slope portion 12b is pressed against the edge of the positioning hole 14 and the nut member 9 is pushed into the pickup unit 4, the positioning member 12 is inserted into the positioning hole 14 and the nut member 9 spirals along the slope portion 12b. It moves parallel to the inclination direction of the groove 8a. For this reason, also in this example, as shown in FIG. 8, the tooth-like projections 9a formed on the nut member 9 can be smoothly fitted into the inside along the spiral groove 8a, and the two can be appropriately meshed.

The perspective view of the drive unit which comprises the disk drive device based on this invention A perspective view showing a configuration example of a pickup moving mechanism The perspective view which looked at FIG. 2 from the lower part Perspective view of nut member The perspective view which looked at FIG. 4 from the opposite side The perspective view which showed the state which couple | bonds a nut member with a pickup unit Explanatory drawing partially enlarged showing the state when the nut member is joined Explanatory drawing which shows the meshing state of a tooth-like protrusion and a spiral groove The perspective view of the pickup unit which shows the example of a change of this invention Explanatory drawing which shows the state which couple | bonds a nut member with the pickup unit of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive unit 2 Base chassis 4 Pickup unit 5 Turntable 6 Guide shaft 7 Motor 8 Feed screw 8a Spiral groove 9 Nut member 9a Tooth-like protrusion 12 Positioning pin 12a Upright part 12b Slope part 14 Positioning hole

Claims (2)

A disk rotating unit; a pickup unit that is movable in a radial direction along a disk surface of the disk that is rotationally driven by the disk rotating unit; and a pickup moving mechanism that moves the pickup unit in the radial direction of the disk. And
A feed screw that is rotatably provided adjacent to the pickup unit; and a nut member that is coupled to a fixed position of the pickup unit and converts the rotational movement of the feed screw into a linear movement of the pickup unit. Including
In the disk drive device having a configuration in which the nut member is provided with a tooth-like protrusion that meshes with the spiral groove of the feed screw,
Nut coupling means for moving and guiding the nut member along an inclination direction of the spiral groove between the pickup unit and the feed screw when the nut member is coupled to a fixed position of the pickup unit; A disk drive characterized by the above.   As the nut guiding means, a positioning pin is provided in at least one of the pickup unit and the nut member, and a positioning hole into which the positioning pin is inserted is provided in the other of the pickup unit and the nut member, and the positioning pin 2. The disk drive device according to claim 1, wherein an inclined surface having an acute angle that is the same as the lead angle of the spiral groove is formed at an angle formed with the axis of the positioning pin.

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