JP2012023796A - Motor unit and disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor unit which solves the problem that the warpage occurs in a circuit board when the circuit board is fixed to a fitting plate by calking.SOLUTION: A motor unit 11 includes a motor part 111, a fitting plate 112 on which the motor part is mounted, and a circuit board 113 fixed to the fitting plate. The circuit board has a hole, and the fitting plate has a plate part and a calking part 4 which protrudes upward from the plate part to be inserted into the hole. The calking part is formed by pressing an upper part of a cylindrical part protruding upward from the plate part in the radially outward direction, and an edge of the hole has a contact part pressed downward by the upper part and a non-contact part 513 which is not in contact with the upper part.

Description

  The present invention relates to a motor unit used in a disk drive device or the like.

2. Description of the Related Art A disk drive device that reads and writes information from a DVD (digital versatile disc) or a Blu-ray disc includes a motor unit in which a motor and a circuit board are mounted on a mounting plate. Japanese Patent Application Laid-Open No. 2002-262540 discloses a technique in which a printed circuit board is bonded onto a mounting base portion with a double-sided tape.
JP 2002-262540 A

  DIS drive devices mounted on notebook personal computers and car navigation systems are required to be small and thin. For this reason, the motor unit is also required to be reduced in size and thickness. However, when the electronic component is soldered to the circuit board by reflow, the circuit board slightly warps due to the influence of heat because the linear expansion coefficient of the electronic component such as the connector is different from that of the circuit board. If the circuit board is warped, the housing of the disk drive device and the circuit board may interfere with each other.

  For this reason, when fixing the circuit board to the mounting plate with double-sided tape, after the circuit board is bonded to the mounting plate, again, press various parts of the circuit board against the mounting plate to correct the warping of the circuit board Is required. As a result, the number of work steps increases.

  The warping of the circuit board accompanying the reflow soldering process can be corrected to some extent by inserting the burring portion formed on the mounting plate into the through hole of the circuit board and fixing it. However, in such caulking, since the edge of the inner peripheral surface of the through hole of the circuit board is strongly pressed toward the mounting plate, a new warp occurs in the circuit board, and other parts of the circuit board are attached to the mounting plate. There is a risk of separation.

  An object of the present invention is to reduce warpage generated in a circuit board when the circuit board is caulked and fixed to the mounting board by a burring portion formed on the mounting board.

  An exemplary motor unit of the present invention includes a motor unit, a mounting plate to which the motor unit is mounted, and a circuit board fixed on the mounting plate, and the circuit board has a hole. The mounting plate includes a plate portion, and a caulking portion that protrudes upward from the plate portion and is inserted into the hole portion, and the caulking portion protrudes upward from the plate portion. The upper part is expanded outward in the radial direction, and the edge of the hole has a contact part that is pressed downward by the upper part and a non-contact part that is not in contact with the upper part.

  ADVANTAGE OF THE INVENTION According to this invention, the curvature of the circuit board by crimping can be reduced in the site | part outside the non-contact part of the hole of a circuit board.

FIG. 1 is a diagram showing a disk drive device. FIG. 2 is a plan view of the motor unit. FIG. 3 is a plan view of the circuit board. FIG. 4 is an enlarged view of the long hole portion. FIG. 5 is a cross-sectional view of the circuit board and the mounting plate. FIG. 6 is a cross-sectional view of the circuit board and the mounting plate. FIG. 7 is an enlarged plan view showing the long hole portion and the caulking portion. FIG. 8 is a perspective view of the long hole portion and the caulking portion. FIG. 9 is a perspective view showing a caulking portion during attachment. FIG. 10 is a diagram showing combinations of holes on the circuit board. FIG. 11 is a diagram illustrating another example of combinations of holes. FIG. 12 is a diagram illustrating still another example of combinations of holes. FIG. 13 is a diagram showing still another example of the combination of holes. FIG. 14 is a diagram showing still another example of the combination of holes. FIG. 15 is a diagram showing the arrangement of circular holes and long holes. FIG. 16 is a diagram illustrating a motor unit according to another example. FIG. 17 is a diagram illustrating another example of the hole. FIG. 18 is a diagram illustrating still another example of the hole.

  In this specification, the side of the circuit board on which the motor unit is located is simply referred to as “upper side”, and the opposite side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship or direction when incorporated in an actual device.

  FIG. 1 is a cross-sectional view of a disk drive device 10 including a motor unit according to an exemplary embodiment of the present invention. The disk drive device 10 includes a motor unit 11, an access unit 12, and a box-shaped housing 13 that accommodates them. In FIG. 1, the disk 9 is indicated by a two-dot chain line. The motor unit 11 includes a motor unit 111, a mounting plate 112, and a circuit board 113. The motor unit 111 is a slim type having a height of several mm to several tens of mm. In the motor unit 111, the upper chucking device 14 is fitted in the central hole 91 of the disk 9, and the disk 9 is fixed by the chucking device 14. The access unit 12 includes a head 121 and a head moving mechanism 122. The head 121 is an optical pickup mechanism that reads and / or writes information on the disk 9. As the disc 9, for example, a Blu-ray disc is used. Other types of optical discs may be used.

  The head moving mechanism 122 moves the head 121 with respect to the motor unit 111 and the disk 9. The head 121 has a light emitting part and a light receiving part. The light emitting part emits laser light toward the lower surface of the disk 9. The light receiving unit receives reflected light from the disk 9. The housing 13 has a lid portion 131 that opens and closes when the disk 9 is attached to and removed from the disk drive device 10. In the disk drive device 10, the disk 9 is rotated by the motor unit 111, and the head moving mechanism 122 moves the head 121 to a required position, and information is read from and / or written to the disk 9.

  FIG. 2 is a plan view of the motor unit 11. In the motor unit 11, the motor unit 111 and the circuit board 113 are mounted on the mounting plate 112. As shown in FIG. 2, the chucking device 14 has a plurality of claw members 141 in the circumferential direction. The claw member 141 is slidable in the radial direction and is urged outward in the radial direction. When the disc 9 is fixed to the chucking device 14, the claw member 141 moves inward in the radial direction and rides on the edge of the central hole 91. Thereby, the site | part surrounding the center hole 91 is pushed to radial direction outward and downward.

  The circuit board 113 is fixed on the mounting plate 112 by caulking, as will be described later. The circuit board 113 is provided with a connector portion 114. The connector part 114 is connected to other parts in the disk drive device 10 via a cable. The connector part 114 has many terminal pins, and the terminal pins are soldered to the circuit board 113 by a reflow process. In practice, other electronic components such as sensors and switches are also mounted on the circuit board 113. The motor unit 111 is driven and controlled by the circuit board 113 based on a signal input to the connector unit 114.

  FIG. 3 is a plan view of the circuit board 113. The circuit board 113 includes a plurality of circular hole portions 21 and a plurality of long hole portions 22. FIG. 4 is an enlarged view of the elongated hole 22 in the upper right of FIG. In FIG. 4, the upper surface of the circuit board 113 is indicated by parallel oblique lines. The same applies to the other figures below. The elongated hole portion 22 in FIG. 4 extends in the vertical direction in FIG. The edge 51 of the long hole portion 22 includes two semicircular portions 511 and two straight portions 512. The diameters of the two semicircular portions 511 are the same. The two semicircular portions 511 are located at both ends of the long hole portion 22 in the extending direction of the long hole portion 22 (hereinafter referred to as “longitudinal direction”), and are convex outward. The two linear portions 512 are parallel to each other and connect the ends of the two semicircular portions 511.

  As shown in FIG. 2, the mounting plate 112 includes a plate portion 112 a, a plurality of substantially cylindrical caulking portions 4, and a caulking portion 112 b having a shape different from the caulking portion 4. The caulking portion 4 protrudes upward from the plate portion 112a and is inserted into the circular hole portion 21 and the long hole portion 22 in FIG. The caulking portion 112b is located at the outer edge portion of the mounting plate 112, and is formed by plastically deforming a part of the mounting plate 112 inward.

  FIG. 5 is a longitudinal sectional view of the mounting plate 112 and the circuit board 113 in the vicinity of the caulking portion 4 at the lower right of FIG. A thin insulating sheet 116 is provided between the mounting plate 112 and the circuit board 113. The caulking portion 4 has an upper portion 411 that spreads outward in the radial direction around the central axis C1 of the caulking portion 4. The upper portion 411 presses the upper end of the edge 53 of the circular hole portion 21 downward and radially outward around the central axis C1 over the entire circumference. When the circuit board 113 is fixed to the mounting plate 112, as shown in FIG. 6, a cylindrical portion 49 protruding upward from the plate portion 112a in parallel to the central axis C1 is formed in advance as a burring portion by burring. . The cylindrical portion 49 is inserted into the circular hole portion 21. Then, a predetermined jig is inserted into the cylindrical portion 49 from above, and the upper portion 411 is spread outward in the radial direction.

  FIG. 7 is an enlarged plan view showing the elongated hole portion 22 and the caulking portion 4 in the upper right of FIG. The caulking portion 4 has the same shape as the caulking portion 4 inserted into the circular hole portion 21 shown in FIG. In FIG. 7, a range in which the upper portion 411 of the caulking portion 4 and the edge 51 of the long hole portion 22 are in contact is indicated by a thick solid line. FIG. 8 is a perspective view of the caulking portion 4 and the long hole portion 22. The caulking portion 4 is located at one end 52 in the longitudinal direction of the long hole portion 22. Hereinafter, the end portion 52 is referred to as a “caulking position end portion 52”.

  The contact range between the upper portion 411 of the caulking portion 4 and the edge 51 of the long hole portion 22 is approximately 180 degrees with the central axis C2 of the caulking portion 4 as the center. A part of the upper part 411 of the caulking part 4 presses the semicircular part 511 located at the caulking position end part 52 downward and radially outward with the central axis C2 of the caulking part 4 as the center. Hereinafter, the semicircular portion 511 on the caulking position end portion 52 side is referred to as a “contact portion 511”. In the long hole portion 22, the semicircular portion 511 and the two straight portions 512 on the side opposite to the caulking position end portion 52 are not in contact with the caulking portion 4. Hereinafter, the semicircular portion 511 and the two straight portions 512 opposite to the caulking position end portion 52 are collectively referred to as “non-contact portions 513”.

  When the circuit board 113 is fixed to the mounting plate 112, as shown in FIG. 9, the cylindrical portion 49 extending in parallel with the central axis C2 is inserted into the caulking position end 52 side of the long hole portion 22. A jig is inserted into the cylindrical portion 49, and the upper portion 411 is plastically deformed radially outward.

  In the following description, when the upper right long hole portion 22 in FIG. 2 is distinguished from the upper left long hole portion 22, it is referred to as a “right long hole portion 22”. The upper left long hole portion 22 is referred to as a “left long hole portion 22”.

  In the motor unit 11, the circuit board 113 is fixed to the mounting plate 112 by the caulking portion 4, so that the mounting plate is compared with a method in which the entire surface of the circuit board 113 is bonded to the mounting plate 112 using a double-sided tape. The fixing work to 112 can be performed in a short time. Further, in the motor unit 11, the caulking portion 4 presses a part of the periphery of the long hole portion 22 of the circuit board 113 and a portion around the circular hole portion 21 to the mounting plate 112. The circuit board 113 is prevented from being largely separated from the mounting plate 112. In particular, a portion near the connector portion 114 having a large warp is firmly fixed by the three caulking portions 4.

  By the way, in a circuit board having only a circular hole, if there is no other fixing part such as an adhesive in a portion between the caulking part and the outer edge part of the circuit board, the caulking part is pressed downward (accurately). In other words, the portion is warped by at least a pressing having a component directed downward, that is, separated upward from the mounting plate. In the circuit board 113, the upper portion of the right long hole portion 22 in FIG. 2 is the non-contact portion 513, and therefore, the upper portion of the right long hole portion 22 in FIG. 2 is warped by the press of the caulking portion 4. It is prevented. Similarly, since the left portion of the left long hole portion 22 in FIG. 2 is the non-contact portion 513, the left portion of the left long hole portion 22 is prevented from being warped by the caulking portion 4.

  Next, a method for fixing the position and orientation of the circuit board 113 in a plane parallel to the mounting plate 112 will be described. FIG. 10 is a diagram illustrating a combination of holes on the circuit board 113. The circuit board 113 includes one long hole portion 22 and one circular hole portion 21. The long hole portion 22 has the same shape as the long hole portion 22 shown in FIG. However, the extending direction of the long hole portion 22 is different. The caulking portion 4 inserted into the circular hole portion 21 and the long hole portion 22 has the same shape as the caulking portion 4 shown in FIGS. 5 and 8. The same applies to the other figures below.

  As indicated by a two-dot chain line in FIG. 10, the circular hole portion 21 and the circular hole portion 21 are formed from a straight line 81 that passes through the center of the caulking portion 4 in the long hole portion 22 and perpendicular to the longitudinal direction of the long hole portion 22. The inner caulking part 4 exists apart. In other words, the long hole portion 22 extends in a direction different from the direction perpendicular to the direction from the caulking portion 4 located inside to the other caulking portion 4. In the circuit board 113, since the edge 53 of the circular hole portion 21 is in contact with the caulking portion 4 over the entire circumference, the circuit board 113 cannot be translated in a plane parallel to the mounting plate 112. That is, it cannot move in a state where the orientation is fixed.

  By the way, since the non-contact part 513 is provided in the long hole part 22, when the circular hole part 21 does not exist, there exists a possibility that the circuit board 113 may rotate slightly centering | focusing on the arbitrary positions on the straight line 81. FIG. However, in the circuit board 113, the circular hole portion 21 is provided at a position away from the straight line 81, thereby preventing the circuit board 113 from rotating around an arbitrary position on the straight line 81. As a result, the position and orientation of the circuit board 113 are easily fixed by the one circular hole portion 21 and the one long hole portion 22.

  In the circuit board 113, in consideration of a processing error, the circular hole portion 21 shown in FIG. 10 is separated from a region that extends in a range of ± 10 degrees on both sides of the straight line 81 with the caulking portion 4 in the long hole portion 22 as the center. Are preferably present. More preferably, the circular hole portion 21 is provided apart from a region extending from the straight line 81 within a range of ± 30 degrees. In other words, the direction in which the long hole portion 22 extends from the caulking portion 4 is 30 degrees or less or 150 degrees with respect to the direction connecting the caulking portion 4 of the long hole portion 22 and the caulking portion 4 of the circular hole portion 21. The difference is 180 degrees or less. Thereby, rattling of the circuit board 113 is prevented more reliably.

  FIG. 11 is a diagram illustrating another example of combinations of holes on the circuit board 113. The circuit board 113 includes a first long hole portion 22a and a second long hole portion 22b. The direction in which the first long hole portion 22a extends is different from the direction in which the second long hole portion 22b extends. In the 1st long hole part 22a, the 1st crimping part 4a is located in the edge part near the 2nd long hole part 22b in a longitudinal direction, ie, the near edge part among both ends. Therefore, the part near the end part of the edge 51 of the first long hole part 22a is the contact part 511, and the other part is the non-contact part 513. Similarly, in the second long hole portion 22b, the second caulking portion 4b is located at an end portion close to the first long hole portion 22a in the longitudinal direction. That is, the part near the end part of the edge 51 of the second long hole part 22 b is the contact part 511, and the other part is the non-contact part 513.

  When only the first long hole portion 22a exists, the circuit board 113 can be translated only in the direction from the non-contact portion 513 toward the first caulking portion 4a. When only the second long hole portion 22b exists, the circuit board 113 can be translated only in the direction from the non-contact portion 513 toward the second caulking portion 4b. However, since the extending direction of the first long hole portion 22a and the extending direction of the second long hole portion 22b are different, the circuit board 113 cannot be translated in any direction in a plane parallel to the mounting plate 112.

  When only the first long hole portion 22a exists, the circuit board 113 passes through the first caulking portion 4a and is perpendicular to the extending direction of the first long hole portion 22a (hereinafter referred to as “first straight line 821”). There is a risk of rotating in a circumferential direction centered on an arbitrary position. When only the second long hole portion 22b exists, the circuit board 113 passes through the second caulking portion 4b and is a straight line perpendicular to the extending direction of the second long hole portion 22b (hereinafter, “second straight line 822”). There is a risk of rotating in a circumferential direction centered on an arbitrary position.

  Therefore, there is a possibility that the circuit board 113 rotates around the intersection 71 between the first straight line 821 and the second straight line 822. However, in the first long hole portion 22a and the second long hole portion 22b, in the circumferential direction around the intersection 71, the direction in which the first long hole portion 22a extends from the first caulking portion 4a and the second caulking portion 4b. The direction in which the second long hole portion 22b extends is opposite. As a result, the circuit board 113 does not rotate around the intersection 71. That is, the first caulking portion 4a and the second caulking portion 4b prevent the circuit board 113 from rotating. As described above, in the circuit board 113, the position and orientation of the circuit board 113 are easily fixed by the two long holes.

  In the circuit board 113, preferably, the first caulking portion 4a is centered on the first straight line 821 on both sides of the first straight line 821, and the second caulking portion 4b is centered on both sides of the second straight line 822. In the circumferential direction centering on an arbitrary position in the region where the region extending within a range of ± 10 degrees overlaps, the direction in which the first long hole portion 22a extends from the first caulking portion 4a and the second caulking portion 4b to the second The direction in which the long hole portion 22b extends is opposite. More preferably, in the circumferential direction centered at an arbitrary position in a region where the regions extending in a range of ± 30 degrees overlap each other on both sides of both straight lines 821 and 822, the direction in which the elongated hole portion extends from both the caulking portions is opposite. Is done. Thereby, rattling of the circuit board 113 with respect to the mounting plate 112 is prevented more reliably.

  In the circuit board 113, the first caulking portion 4a is located at an end portion far from the second long hole portion 22b of the first long hole portion 22a, that is, an end portion farther out of both end portions, and the second long hole portion. The 2nd crimp part 4b may be located in the edge part far from the 1st long hole part 22a of 22b. Even in this case, the position and orientation of the circuit board 113 can be fixed.

  FIG. 12 is a diagram illustrating still another example of combinations of holes. In the circuit board 113 shown in FIG. 12, the first long hole portion 22a and the second long hole portion 22b extend in parallel to each other. In the following description, the same reference numerals are given to the same components as those in FIG. In the first long hole portion 22a, the first caulking portion 4a is located at an end portion close to the second long hole portion 22b in the longitudinal direction. In the second long hole portion 22b, the second caulking portion 4b is located at an end portion close to the first long hole portion 22a in the longitudinal direction.

  In the circuit board 113, the direction in which the first long hole portion 22a extends from the first caulking portion 4a and the direction in which the second long hole portion 22b extends from the second caulking portion 4b are opposite to each other. The direction in which the circuit board 113 can be translated when only the portion 22a is present differs from the direction in which the circuit board 113 can be translated when only the second long hole portion 22b is present. Thereby, the parallel movement of the circuit board 113 in an arbitrary direction within a plane parallel to the mounting plate 112 is prevented.

  In the circuit board 113, a first straight line 821 passing through the first caulking portion 4a and perpendicular to the first long hole portion 22a and a second straight portion 82b passing through the second caulking portion 4b and perpendicular to the second long hole portion 22b. Two straight lines 822 are parallel and spaced apart from each other. As described above, when only the first caulking portion 4a exists, the circuit board 113 may rotate around an arbitrary position on the first straight line 821, and only the second caulking portion 4b exists. In this case, the circuit board 113 may rotate around an arbitrary position on the second straight line 822. However, in the circuit board 113, since the first straight line 821 and the second straight line 822 are separated from each other, the circuit board 113 is prevented from rotating.

  Also in the case shown in FIG. 12, the position and orientation of the circuit board 113 are easily fixed by the two long hole portions 22. In the circuit board 113, the first caulking portion 4a is located at the end portion of the first long hole portion 22a far from the second long hole portion 22b, and the end portion of the second long hole portion 22b far from the first long hole portion 22a. The second caulking portion 4b may be located.

  In the circuit board 113, preferably, the first caulking portion 4a is centered on the first straight line 821 on both sides of the first straight line 821, and the second caulking portion 4b is centered on both sides of the second straight line 822. In the circumferential direction centering on an arbitrary position in the region where the region extending within a range of ± 10 degrees overlaps, the direction in which the first long hole portion 22a extends from the first caulking portion 4a and the second caulking portion 4b to the second The direction in which the long hole portion 22b extends is opposite. More preferably, in the circumferential direction centered at an arbitrary position in a region where the regions extending in a range of ± 30 degrees overlap each other on both sides of both straight lines 821 and 822, the direction in which the elongated hole portion extends from both the caulking portions is opposite. Is done. Thereby, rattling of the circuit board 113 with respect to the mounting plate 112 is prevented more reliably.

  FIG. 13 is a diagram showing still another example of the combination of holes. The circuit board 113 includes three elongated holes 22. Hereinafter, the first upper hole 22a, the second second hole 22b, and the third third hole 22c are called counterclockwise from the upper right long hole in FIG. The three caulking portions 4 inserted into the first to third elongated hole portions 22a to 22c are referred to as “first caulking portion 4a”, “second caulking portion 4b”, and “third caulking portion 4c”.

  The extending directions of the first to third elongated holes 22 a to 22 c are different from each other, and the circuit board 113 cannot move in parallel with the mounting plate 112. In the first long hole portion 22a, the first caulking portion 4a is located at an end portion close to the second long hole portion 22b in the longitudinal direction. In the 2nd long hole part 22b, the 2nd crimp part 4b is located in the edge part near the 3rd long hole part 22c. In the 3rd long hole part 22c, the 3rd crimp part 4c is located in the edge part near the 1st long hole part 22a.

  In the circuit board 113, the first straight line 821 passing through the first caulking portion 4a and perpendicular to the extending direction of the first long hole portion 22a and the second caulking portion 4b passing through the first caulking portion 22a and perpendicular to the extending direction of the second long hole portion 22b. The second straight line 822 intersects. In the circumferential direction centering on the first intersection 71 between the first straight line 821 and the second straight line 822, the direction in which the first long hole portion 22a extends from the first swaging portion 4a and the second long hole from the second swaging portion 4b. The direction in which the portion 22b extends is the same direction. That is, when only the first long hole portion 22 a and the second long hole portion 22 b exist, the circuit board 113 may rotate around the first intersection 71.

  Further, the second straight line 822 intersects with the third straight line 823 that passes through the third caulking portion 4c and is perpendicular to the direction in which the third long hole portion 22c extends. In the circumferential direction centering on the second intersection 72 of the second straight line 822 and the third straight line 823, the direction in which the second long hole part 22b extends from the second caulking part 4b, and the third long hole from the third caulking part 4c. The direction in which the portion 22c extends is the same direction. That is, when only the second long hole portion 22 b and the third long hole portion 22 c exist, the circuit board 113 may rotate around the second intersection 72.

  Further, the third straight line 823 and the first straight line 821 intersect each other, and in the circumferential direction centering on the third intersection 73 between the third straight line 823 and the first straight line 821, the third caulking portion 4c extends to the third long hole. The direction in which the portion 22c extends and the direction in which the first long hole portion 22a extends from the first caulking portion 4a are the same direction. That is, when only the third long hole portion 22 c and the first long hole portion 22 a exist, the circuit board 113 may rotate around the third intersection 73.

  However, in the circuit board 113, since the first to third intersections 71 to 73 exist apart from each other, all of the first long hole portion 22a, the second long hole portion 22b, and the third long hole portion 22c can be rotated. There is no center of rotation. As described above, even when the circuit board 113 cannot be fixed by any two long hole portions 22, the position and orientation of the circuit board 113 are fixed by the three long hole portions 22.

  In the circuit board 113, it is preferable that the first caulking portion 4a is centered on the first straight line 821 on both sides of the first straight line 821 in a range of ± 10 degrees, and the second caulking portion 4b is centered on the both sides of the second straight line 822 ± 10 degrees. Of the first to third intersections 71 to 73 on the outer side of the region extending in the range of ± 10 degrees and the region extending in the range of ± 10 degrees on both sides of the third straight line 823 with the third caulking portion 4c as the center. There is at least one. More preferably, at least one of the first to third intersections 71 to 73 exists outside the region where the regions extending in the range of ± 30 degrees overlap on both sides of the three straight lines 821 to 823. Thereby, rattling of the circuit board 113 with respect to the mounting plate 112 is prevented more reliably.

  FIG. 14 is a diagram showing still another example of the combination of holes. In the circuit board 113, the right first long hole portion 22a and the central second long hole portion 22b in FIG. 14 extend in parallel to each other. The direction in which the first long hole portion 22a extends from the first caulking portion 4a is the same as the direction in which the second long hole portion 22b extends from the second caulking portion 4b. Further, the extending direction of the left third elongated hole portion 22c is different from the extending direction of the first and second elongated hole portions 22a and 22b.

  In the circuit board 113, a second straight line 822 passing through the second caulking portion 4b and perpendicular to the second long hole portion 22b, and a third straight line 823 passing through the third caulking portion 4c and perpendicular to the third long hole portion 22c, Intersect. In the circumferential direction centering on the second intersection 72 of the second straight line 822 and the third straight line 823, the direction in which the second long hole part 22b extends from the second caulking part 4b, and the third long hole from the third caulking part 4c. The direction in which the portion 22c extends is the same direction. That is, when only the second long hole portion 22 b and the third long hole portion 22 c exist, the circuit board 113 may rotate around the second intersection 72.

  Further, the third straight line 823 and the first straight line 821 passing through the first caulking portion 4a and perpendicular to the first long hole portion 22a intersect, and a third intersection 73 of the third straight line 823 and the first straight line 821 is obtained. In the circumferential direction as the center, the direction in which the third long hole portion 22c extends from the third caulking portion 4c and the direction in which the first long hole portion 22a extends from the first caulking portion 4a are the same direction. That is, when only the third long hole portion 22 c and the first long hole portion 22 a exist, the circuit board 113 may rotate around the third intersection 73.

  However, since the second intersection point 72 and the third intersection point 73 are separated from each other, there exists a rotation center that allows all of the first elongated hole portion 22a, the second elongated hole portion 22b, and the third elongated hole portion 22c to rotate. do not do. As a result, the position and orientation of the circuit board 113 are fixed by the three long hole portions 22.

  In the circuit board 113, preferably, similarly to FIG. 13, the second caulking portion is an area extending in the range of ± 10 degrees (more preferably ± 30 degrees) on both sides of the first straight line 821 around the first caulking portion 4a. An area extending in the range of ± 10 degrees (more preferably ± 30 degrees) on both sides of the second straight line 822 with 4b as the center, and a range of ± 10 degrees on both sides of the third straight line 823 with the third caulking portion 4c as the center There is at least one of the second and third intersections 72 and 73 outside the region where the region extending in (3) overlaps. Thereby, rattling of the circuit board 113 is prevented more reliably.

  FIG. 15 is a diagram showing the arrangement of the circular hole portions 21 and the long hole portions 22 of the motor unit 11 shown in FIG. 2, and also shows the caulking portions 4 in the circular hole portions 21 and the long hole portions 22. In FIG. 15, for the sake of illustration, the distance between the holes is shown shorter than in FIG. 2, and other members on the circuit board 113 such as the motor unit 111 are not shown. In the circuit board 113, three circular hole portions 21 exist apart from a straight line 841 that passes through the caulking portion 4 in the right long hole portion 22 and is perpendicular to the longitudinal direction of the right long hole portion 22 on the right side in FIG. 15. . Similarly, there are three circular hole portions 21 that are separated from a straight line 842 that is perpendicular to the longitudinal direction of the left long hole portion 22 and passes through the caulking portion 4 in the left long hole portion 22. In the circuit board 113, the same relationship as the fixed pattern shown in FIG. 10 is established between the right long hole portion 22 and each circular hole portion 21 and between the left long hole portion 22 and each circular hole portion 21. . Thereby, the position and orientation of the circuit board 113 are securely fixed.

  Although the motor unit 11 has been described above, the circuit board 113 can reduce the warpage of the circuit board 113 due to caulking at a portion outside the non-contact part 513 by providing the non-contact part 513. By reducing the warpage of the circuit board 113, electronic components such as Hall elements, other sensors, and switches are accurately arranged with respect to the motor unit 111, and the reliability of the operation of the motor unit 111 is improved. Further, interference between the electronic component and other members in the disk drive device 10 is also prevented.

  In the circuit board 113, the non-contact part 513 can be easily provided by forming the long hole part 22. Since the direction in which the elongated hole portion 22 extends from the caulking portion 4 is different from the direction in which the caulking portion 4 and the other caulking portion 4 are connected, warpage at the outer edge portion 113a of the circuit board 113 can be efficiently reduced.

  In the motor unit 11, at least one of screwing or riveting may be used together with caulking and the circuit board 113 may be fixed to the mounting plate 112. Thereby, the circuit board 113 can be more reliably fixed. A part of the circuit board 113 may be bonded to the mounting plate 112 using an adhesive or a double-sided tape. By using the caulking and bonding together, it is possible to reduce the complexity of the operation compared to the method of bonding the entire surface of the circuit board 113 to the mounting plate 112. In the circuit board 113, when the long hole portion 22 is provided, the direction from the caulking portion 4 in the long hole portion 22 toward the bonding portion is different from the direction in which the long hole portion 22 extends from the caulking portion 4. Warpage of the substrate 113 can be reduced. The same applies when screwing and riveting are performed.

  FIG. 16 is a diagram illustrating a motor unit 11 according to another example. The mounting plate 115 of the motor unit 11 is obtained by omitting a portion on the right side of the mounting plate 112 of FIG. 2 from the position indicated by a broken line denoted by reference numeral 89 in FIG. That is, the circuit board 113 includes a protruding portion 113b that protrudes from the mounting plate 115 in the direction parallel to the mounting plate 115 to the right. On the left side of the boundary 89 between the protruding portion 113b and the mounting plate 115, a long hole portion 22 extending toward the protruding portion 113b is provided. Hereinafter, the long hole portion 22 positioned approximately in the center of the circuit board 113 in the left-right direction is referred to as a “central long hole portion 22”.

  Further, the left long hole portion 22 is provided on the upper left in FIG. 16 as in FIG. 2, and the circular hole portion 21 is provided on the left side of the connector portion 114. The circuit board 113 is fixed to the mounting plate 115 by the caulking portion 4 inserted into the central long hole portion 22, the left long hole portion 22 and the circular hole portion 21. The extending directions of the left long hole portion 22 and the central long hole portion 22 are parallel to each other. Other structures of the mounting plate 115 and the circuit board 113 are the same as those of the mounting plate 112 and the circuit board 113 in FIG.

  In the central long hole portion 22, the caulking portion 4 is located at an end portion far from the boundary 89. Further, a non-contact portion 513 is provided on the protruding portion 113 b side of the caulking portion 4. In the motor unit 11, a portion near the boundary 89 of the circuit board 113 is not pressed downward by the caulking portion 4, so that upward warping of the protruding portion 113 b due to the pressing of the caulking portion 4 can be reduced. In the circuit board 113, since it is not necessary to provide another fixing part such as an adhesive between the central long hole part 22 and the protruding part 113b, the circuit board 113 can be easily attached.

  By providing the long hole portion 22, the caulking and fixing on the circuit board 113 can be performed at a position far away from the outer edge portion 113a of the circuit board 113. As a result, the motor unit 11 using the caulking and fixing is designed. The degree of freedom can be improved.

  In the circuit board 113, the circular hole portion 21 exists away from a straight line 843 that is perpendicular to the longitudinal direction of the central long hole portion 22 and passes through the caulking portion 4 in the central long hole portion 22. Similarly, the circular hole portion 21 exists away from a straight line 844 that is perpendicular to the longitudinal direction of the left long hole portion 22 and passes through the caulking portion 4 in the left long hole portion 22. That is, the same fixed pattern as that in FIG. 10 is established between the left long hole portion 22 and the central long hole portion 22 and the circular hole portion 21.

  In addition, the direction in which the central long hole portion 22 extends from the caulking portion 4 in the central long hole portion 22 and the direction in which the left long hole portion 22 extends from the caulking portion 4 in the left long hole portion 22 are opposite to each other. 843 and 844 are parallel and spaced apart from each other. That is, a fixed pattern similar to that in FIG. 12 is established between the left long hole portion 22 and the central long hole portion 22. As a result, the position and orientation of the circuit board 113 with respect to the mounting plate 115 are reliably fixed by the central long hole portion 22, the left long hole portion 22 and the circular hole portion 21.

  FIG. 17 is a diagram illustrating another example of the hole of the circuit board 113. The edge 231 of the hole 23 includes two arc-shaped contact portions 232 and two slit-shaped or notched non-contact portions 233. The two contact portions 232 are part of a circle having the same diameter centered on the central axis C <b> 3 of the hole portion 23. The non-contact portion 233 is recessed radially outward from the center between the two contact portions 232 about the central axis C3. Each of the ranges where the two contact portions 232 exist around the central axis C3 is approximately 150 degrees. Each of the two non-contact portions 233 exists in a range of about 30 degrees with the central axis C3 as the center.

  By providing the two non-contact portions 233 in the hole portion 23, the warp of the circuit board 113 due to the pressing of the caulking portion 4 is reduced in the left-right direction of FIG. In addition, since each non-contact portion 233 exists in a range of less than 180 degrees with the central axis C3 as the center, the parallel movement of the circuit board 113 is prevented by one hole portion 23. Therefore, by providing two or more holes 23, the circuit board 113 can be fixed to the mounting plate. Moreover, the hole part 23 and the circular hole part 21 of FIG. 5 may be combined. Furthermore, the hole part 23 and the long hole part 22 of FIG. 7 may be combined.

  FIG. 18 is a diagram illustrating still another example of the hole. The edge 241 of the hole portion 24 includes one arc-shaped contact portion 242 and one non-contact portion 243 that is recessed outward in the radial direction around the central axis C <b> 4 of the hole portion 24. The existence range of the contact portion 242 centered on the central axis C4 is approximately 300 degrees. Since the existence range of the non-contact part 243 centering on the central axis C4 is less than 180 degrees, the caulking part 4 does not move in the hole part 24. In the hole portion 24, since there is only one non-contact portion 243, the circuit board 113 can be firmly fixed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible.

  For example, the circuit board 113 may be provided with many combinations of various holes shown in FIGS. Of course, as described above, another fixing method and the hole and the caulking portion 4 may be used in combination.

  In the said embodiment, it replaces with the hole parts 23 and 24 shown in FIG.17 and FIG.18, and the hole part which has three or more arc-shaped contact parts and three or more non-contact parts may be used. As long as the caulking portion 4 has a shape in which the upper portion of the cylindrical portion is pushed outward in the radial direction, the entire caulking portion 4 or the cross section perpendicular to the central axis of the upper portion may be polygonal. In this case, the contact portion in the above-described embodiment does not have to be a portion where the hole portion and the caulking portion 4 are in a strict sense, but is in strong contact at a plurality of locations, and is close or light at other locations. Refers to the contact area. In addition, only a part of the upper part of the cylindrical part may be spread.

  The structure for fixing the circuit board to the mounting plate described in the above embodiment can also be used for an apparatus that rotates a polygon mirror by a motor unit or rotates other components by a motor unit.

  The present invention can be used in a motor unit for a disk drive device in various electronic devices such as a personal computer, a car navigation system, an audio / video device, and a circuit board and a motor unit are provided on a mounting plate. It can also be used in motor units of other devices.

4, 4a to 4b Caulking portion 9 Disc 10 Disc drive device 11 Motor unit 12 Access portion 13 Housing 21 Circular hole portion 22, 22a to 22c Long hole portion 23, 24 Hole portion 49 Cylindrical portion 51 Edge 52 (of the long hole portion) Caulking position end 53 Edge (of circular hole) 71-73 Intersection 81,821-823,841-844 Straight line 111 Motor part 112,115 Mounting plate 113 Circuit board 113b Protruding part 142 Clamper 231,241 (Hole part) Edge 411 Upper part of caulking part 511, 232, 242 Contact part 513, 233, 243 Non-contact part

Claims (13)

A motor section;
A mounting plate to which the motor unit is mounted;
A circuit board fixed on the mounting plate;
With
The circuit board has a hole;
The mounting plate includes a plate portion, and a caulking portion that protrudes upward from the plate portion and is inserted into the hole portion,
The caulking portion is a portion in which the upper portion of the cylindrical portion protruding upward from the plate portion is pushed outward in the radial direction,
The motor unit which has the contact part to which the edge of the said hole part is pressed below by the said upper part, and the non-contact part which is non-contact with the said upper part. The circuit board includes a protruding portion that protrudes from the mounting plate in a direction parallel to the plate portion,
The motor unit according to claim 1, wherein the non-contact portion is provided on the protruding portion side of the caulking portion. The hole is a long hole,
The motor unit according to claim 1, wherein the contact portion is provided at one end portion in the longitudinal direction of the long hole portion, and the other portion of the edge is the non-contact portion. The mounting plate further includes another caulking portion,
The circuit board further includes another hole portion into which the other caulking portion is inserted,
The motor unit according to claim 3, wherein a direction in which the elongated hole extends from the caulking portion is different from a direction from the caulking portion toward the other caulking portion.   The motor unit according to claim 4, wherein the circuit board is fixed to the mounting plate by the caulking portion and the other caulking portion. The hole is a long hole, and the circuit board further includes a circular hole,
The mounting plate further includes another caulking portion that protrudes upward from the plate portion and is inserted into the circular hole portion,
The other caulking portion is a portion in which the upper portion of the tubular portion protruding upward from the plate portion is pushed outward in the radial direction,
The other caulking portion presses the edge of the circular hole portion downward along the entire circumference,
The motor unit according to claim 3, wherein the circular hole portion is located away from a straight line that passes through the caulking portion and is perpendicular to a direction in which the elongated hole portion extends. The hole is a first slot, and the circuit board further includes a second slot.
The caulking portion is a first caulking portion, and the mounting plate further includes a second caulking portion that protrudes upward from the plate portion and is inserted into the second elongated hole portion,
The second caulking portion is a portion in which the upper portion of the cylindrical portion protruding upward from the plate portion is pushed outward in the radial direction,
Similar to the first long hole portion, the contact portion is provided at one end of the second long hole portion,
A first straight line that passes through the first caulking portion and is perpendicular to a direction in which the first long hole portion extends, and a second straight line that passes through the second caulking portion and is perpendicular to the direction in which the second long hole portion extends. The direction in which the first elongated hole portion extends from the first caulking portion and the direction in which the second elongated hole portion extends from the second caulking portion are opposite in the circumferential direction centering on the intersection. Or
The first straight line and the second straight line are parallel and spaced apart, and a direction in which the first long hole portion extends from the first caulking portion and a direction in which the second long hole portion extends from the second caulking portion. The motor unit according to claim 3, which is in a reverse direction. The hole is a first slot, and the circuit board further includes a second slot and a third slot,
The caulking portion is a first caulking portion, and the mounting plate protrudes upward from the plate portion and is inserted into the second long hole portion and the third long hole portion, respectively. A third caulking part,
The second caulking portion and the third caulking portion are formed by pushing the upper portion of the cylindrical portion protruding upward from the plate portion outward in the radial direction;
Like the first long hole portion, the contact portion is provided at one end of the second long hole portion and the third long hole portion,
A first straight line that passes through the first caulking portion and is perpendicular to a direction in which the first long hole portion extends, and a second straight line that passes through the second caulking portion and is perpendicular to the direction in which the second long hole portion extends. In the circumferential direction centering on the intersection point, the direction in which the first elongated hole portion extends from the first crimped portion and the direction in which the second elongated hole portion extends from the second crimped portion are the same direction. Or
The direction in which the first long hole portion extends and the direction in which the second long hole portion extends are parallel, the direction in which the first long hole portion extends from the first caulking portion, and the direction from the second caulking portion. The direction in which the second elongated hole portion extends is the same direction,
The second straight line intersects with the third straight line passing through the third caulking part and perpendicular to the direction in which the third elongated hole part extends, and from the second caulking part in the circumferential direction centering on the intersection point, The direction in which the second long hole portion extends and the direction in which the third long hole portion extends from the third caulking portion are the same direction,
The third straight line intersects the first straight line, and the third elongated hole extends from the third caulking part in the circumferential direction centering on the intersection, and the first caulking part extends to the first The direction in which the elongated hole extends is the same direction,
4. The motor unit according to claim 3, wherein an intersection of the second straight line and the third straight line is separated from an intersection of the third straight line and the first straight line.   The motor unit according to claim 1, further comprising another fixing portion that fixes the circuit board on the plate portion by bonding, screwing, or riveting.   The motor unit according to claim 1, wherein the non-contact portion exists in a range of less than 180 degrees centering on a center of the caulking portion.   The edge of the hole further includes another contact portion that is pressed downward by the upper portion of the caulking portion, and another non-contact portion that is not in contact with the upper portion. The motor unit described in 1.   The motor unit according to claim 1, wherein the motor unit rotates a disk. The motor unit according to claim 12,
A fixing mechanism for detachably fixing the disk on the motor unit;
An access unit for reading and / or writing information to and from the disk;
A housing for housing the motor unit;
A disk drive device comprising:

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