JP2004319091A - Motor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the tilting (surface inclination) of a turntable and the danger of disconnection of a flat cable in a turntable driving device in which a small motor and an electronic component for turntable driving are mounted on the surface of a metal core printed wiring board, the flat cable is connected, and the backside of the metal core printed wiring board is connected to a chassis. <P>SOLUTION: This turntable driving device is constructed in such a manner that a small motor and an electronic component for driving a turntable are mounted on the surface side of a metal core printed wiring board obtained by counterbore-pressing the surface side and then punch-pressing from a backside. A flat cable is connected to the surface side of the metal core printed wiring board, and the backside of the metal core printed wiring board is attached being stacked on the chassis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotary table driving device such as an optical disk driver.

For example, a rotary table driving device such as a compact disk (CD) player employs a loading method in which a rotary table floats from below to above a horizontally inserted disk medium and fits into a disk hole. is there. As shown in FIGS. 7 and 8, such a rotary table elevating type driving device mounts a small driving motor (spindle motor, brushless motor) 2 and an electronic component P of a rotary table 1, and rotates the motor 2. An iron-coated printed circuit board 3 on which a conductor pattern of a control circuit is printed on the surface, and a terminal strip row 5 having one end exposed to a terminal pad row 4 of printed wiring formed near an edge of the metal-core printed circuit board 3 Is connected and fixed, and the other end 6 is flexibly routed to the back side of an elevating base 7 on which the iron-core printed circuit board 3 is placed and moved up and down, and connected to the connector 8a of the body fixing member 8 by a flat cable ( And a flexible flat parallel wire (FC).

  The coating stripped terminal row 5 is fixed to the terminal pad row 4 with solder 9, but the bent portion of the flat cable FC is moved up and down by about 5 to 7 mm of the metal core printed circuit board 3 attached to the lifting base 7. In order to suppress the peeling force applied to the solder 9 by the springback due to R, an adhesive 10 is applied on the coating exposed terminal row 5, and one end of the flat cable and the iron core printed circuit board 3 are fixed. ing.

  The elevating base 7 is adapted to perform an elevating operation by an actuator (not shown) along the guide column 7a. In order to minimize the tilt (surface inclination) of the disk surface, it is strongly required to control the flatness of the mounting surface (back surface) of the iron-core printed circuit board 3. Incidentally, the iron-core printed circuit board 3 is an iron-core printed wiring board in which an insulating layer 3b such as a resin or an enamel is applied on an iron-based core plate (base plate) 3a and a predetermined conductor pattern 4 is formed by printing. The iron-core printed wiring board is sheared and separated by a punching press (punch) from the back of a multi-core metal core printed wiring board in which a conductor pattern is repeatedly formed in a one-dimensional or two-dimensional direction and printed on the surface. It is obtained by doing. Therefore, the back surface of the iron core printed circuit board 3 is on the sag surface side. Note that a resist ink 11 is applied on the conductor pattern 4.

  However, if the back surface side of the iron-core printed circuit board 3 is a sagging surface, the front surface side inevitably has a fractured surface, so a sharp burr X is generated at the front edge of the iron-core printed circuit board 3. In addition, the curved portion R of the flat cable FC easily comes into contact with the burr X due to the vertical movement of the iron-core printed circuit board 3, and there is a possibility that the flat cable FC is disconnected.

  Therefore, in the assembling process of the rotary table driving device, when the iron core printed circuit board 3 is mounted on the chassis 13, the end of the flat cable FC is prevented from running out. The flat cable FC is fixed with an adhesive tape 12. Since one end of the flat cable FC is clamped by the adhesive tape 12, when the iron-core printed circuit board 3 moves up and down, the flat cable FC does not strongly hit the edge of the iron-core printed circuit board 3, and the flat cable FC Disconnection can be prevented.

  However, when the iron-core printed circuit board 3 moves up and down, the flat cable FC is inevitably moved, so that the adhesive tape 12 itself is easily peeled off. However, there is still a risk of breakage of the flat cable FC since the bonding at the flat cable cannot be expected.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a rotary table driving device that suppresses the tilt (surface inclination) of the rotary table and the risk of disconnection of the flat cable.

  In order to solve the above problems, a rotary table driving device according to the present invention is provided with a counterbore press on the front side, and then a punching press from the back side, on the front side of the metal core printed wiring board, for rotating table driving. A rotary table driving device equipped with a small motor and electronic components, wherein a flat cable is connected to a front side of the metal-core printed wiring board, and a back side of the metal-core printed wiring board is mounted on a chassis in an overlapping manner. It is characterized by having been done.

  In the rotary table driving device according to the present invention, if a counterbore press is performed on the front side of the metal-core printed wiring board in advance, the front surface edge is a sagged surface. The burrs or the like in the cross section are contained within the thickness of the plate and do not protrude from the surface, so that disconnection of the flat cable can be prevented. In addition, since the rear surface side of the metal-core printed wiring board maintaining high flatness is mounted on the chassis so as to be overlapped, the parallelism of the rotary table can be secured.

  Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

  1A is a side view showing a rotary table driving device according to an embodiment of the present invention, FIG. 1B is an enlarged view showing a connection portion between the iron core printed circuit board and a flat cable, and FIG. FIG. 3 is a plan view showing a state where a flat cable is connected to the iron-core printed circuit board.

  A rotary table driving device used for a CD drive, a CD-ROM drive, or the like according to the present embodiment has a small motor (spindle motor, brushless motor) 2 for driving a rotary table 1 and an electronic component P mounted thereon. An exposed conductor terminal row 5 at one end is connected to an iron core printed circuit board 3 having a conductor pattern printed on the surface thereof and a terminal pad row 4 of printed wiring formed near an edge of the metal core printed circuit board 30. A flat cable (flexible) whose other end 6 is bent in a bent shape to the back side of an elevating base 7 on which the iron-core printed circuit board 3 is placed and raised and connected to the connector 8a of the body fixing member 8 Flat parallel wires) FC.

  A rectangular double-sided adhesive tape 40 is adhered to a region inside the terminal pad row 4 on the surface of the iron-core printed circuit board 30 in this example. One end of the flat cable FC is bent and bent, the fold 5a is adhered to the double-sided adhesive tape 40, and the coated terminal row 5 is extended outward from the iron-core printed circuit board 30 to the terminal pad row 4. Is fixed with solder 9.

  A cable stopper projection 50 having a width substantially corresponding to the band width of the flat cable FC is provided near the edge between the edge of the iron core printed circuit board 30 and the terminal pad row 4. The projection 50 for the cable stopper of this embodiment is composed of a base conductor pad 52 and a rounded solder pile 54 fixed thereon.

  When the lifting base 7 moves up and down, the curved portion R of the flat cable FC moves closer to and away from the front edge of the iron-core printed circuit board 30, but the bent portion 5a in which one end of the flat cable FC is bent is formed. Therefore, the flat cable FC itself is elastically urged away from the iron core printed circuit board 30 by the springback of the portion 5a, so that the front side edge of the iron core printed circuit board 30 is formed. Difficult to contact. For this reason, disconnection of the flat cable FC can be prevented.

  Further, since one end side of the flat cable FC is bonded to the area inside the terminal pad row 4 with the double-sided adhesive tape 40, when the coating stripped terminal row 5 is soldered to the terminal pad row 4, the terminal is temporarily fixed due to the temporary fixing state. No displacement occurs, and connection failures and the like can be resolved. Further, even after soldering, the folded portion 5a of the flat cable FC is hardly peeled off by the adhesive force of the double-sided adhesive tape 40, so that even when a tensile stress is generated in the flat cable FC, the peeling of the solder of the terminal pad row 4 is effective. Can be prevented.

  The iron core printed circuit board 30 of this example has a projection 50 for a cable stopper. Before the bent portion R of the flat cable FC hits the cable stopper projection 50 beside the front edge of the iron-core printed circuit board 30 before hitting the front edge, the flat cable FC is connected to the iron-core printed circuit board. It is difficult to hit the front edge of the plate 30. Therefore, disconnection of the flat cable FC can be prevented.

  Here, the cable stopper projection 50 is composed of a base conductor pad 52 and a solder pile 54 fixed thereon. The base conductor pad 52 can be simultaneously formed with the aid of the conductor pattern print forming step, and the solder pile 54 can be simultaneously melted and fixed on the base conductor pad 52 at the time of solder connection, so that the number of steps is not increased. I'm done.

  FIG. 4A is a longitudinal sectional side view showing another iron core printed circuit board 60 used in the rotary table driving device, and FIG. 4B is a perspective view showing a cable wound body 65 attached to the iron core printed circuit board. FIG.

  To this iron core printed circuit board 60, a cable wound body 65 inserted into the inner peripheral side of the folded portion 5a at one end of the flat cable FC is fixed. The cable wound body 65 is composed of a pair of stand pins 65a inserted into the through-holes and a beam 65b fixed to the top thereof and laid horizontally. The folded portion 5a of the flat cable FC is wound around the beam 65b. It has become.

  By providing such a cable wound body 65, it is possible to prevent the flat cable FC from bending at the folded portion 5a and to prevent disconnection at that portion. Further, even if an excessive tensile stress acts on the flat cable FC, the cable wound body 65 blocks the spread of the tension, so that peeling at the double-sided adhesive tape 40 or the solder connection portion can be effectively prevented.

  FIG. 5 is a vertical sectional side view showing still another iron core printed circuit board 70 used in the rotary table driving device.

  The projection 75 for the cable stopper of the iron-core printed circuit board 70 of the present embodiment is a silk-printed thick film layer formed on the coating film of the resist ink 11. The cable stopper projections 75 can be formed with the aid of a silk printing process for printing symbol characters such as a production number on the coating film of the resist ink 11. In such a case, the number of steps does not need to be increased. In order to ensure the thickness of the cable stopper projection 75, a silk-printed thick film layer may be formed on the resist film applied on the underlying conductor pad. Printing methods other than silk printing may be used.

  A burr is formed on the edge of the front surface side of each of the iron core printed circuit boards 30, 60, 70 by a punching press (punch) from the back surface side. The reason why punching is performed from the back side is that high flatness of the back side is required to be maintained in order to secure parallelism when the chassis is mounted.

  6 (a) to 6 (c) are process diagrams showing a method for manufacturing an iron core printed wiring board.

First, a multi-core iron core printed wiring board 80 having a predetermined conductor pattern repeatedly printed in a one-dimensional direction or a two-dimensional direction and printed on the surface is prepared, and as shown in FIG. A counterbore press is applied to the surface 80a of the multi-core iron core printed wiring board 80 in accordance with (shown by a broken line). This counterbore press, as shown in FIG. 6 (b), the press edge surface 80a side becomes sagging face S _1. Next, a punching press (punch) is performed from the back surface 80b. As shown in FIG. 6 (c), the edge is sagging face S ₂ next to the back surface 80b, the thickness of the middle is next shear plane S ₃ of burnishing, sagging face shearing surface S ₃ and the front edge of the middle S ₁ and a rupture surface may occur, and burrs X may appear. Since the burrs X of the fractured surface fall within the plate thickness and do not protrude from the surface, the flat cable can be prevented from being broken by using the iron core printed wiring board manufactured in this manner.

  In each of the above embodiments, the iron-core printed wiring board and the iron-core printed circuit board are used in consideration of securing the substrate strength, the magnetic shielding effect of the motor magnetic field, the heat radiation effect, and the like. , An aluminum core printed circuit board can be used.

(A) is a side view which shows the rotary table drive device which concerns on embodiment of this invention, (b) is an enlarged view which shows the connection part of the iron core printed circuit board and flat cable used for the same rotary table drive device. It is a top view showing the iron core printed circuit board used for the same rotary table drive. It is a top view showing the state where a flat cable was connected to the iron core printed circuit board. (A) is a vertical side view showing another iron core printed circuit board in the rotary table driving device, and (b) is a perspective view showing a cable wound body attached to the iron core printed circuit board. It is a vertical side view which shows another iron core printed circuit board in the same rotary table drive device. (A)-(c) is process drawing which shows the manufacturing method of the iron core printed wiring board used for the iron core printed circuit board in the same rotary table drive. (A) is a side view showing an example of a conventional rotary table driving device, and (b) is an enlarged view showing a connection portion between an iron core printed circuit board and a flat cable used in the rotary table driving device. (A) is a plan view showing a conventional iron-core printed circuit board, and (b) is a bottom view thereof. It is an enlarged view which shows the connection part of the iron core printed circuit board and flat cable used for the conventional rotary table drive.

Explanation of reference numerals

1: Rotary table 2: Small drive motor (spindle motor)
3, 30, 60, 70 ... iron core printed circuit board 4 ... terminal pad row 5 ... coating stripped terminal row 5a at one end of flat cable 5 ... folded section 6 ... other end of flat cable 7 ... elevating base 7a ... guide post 8 ... Airframe fixing member 8a Connector 9 Solder 10 Adhesive 11 Resist ink 12 Adhesive tape 13 Chassis 40 Double-sided adhesive tape 50, 75 Cable protrusion 52 Base conductor pad 54 Solder pad 65 Cable cover Winding body 65a ... Stand pin 65b ... Beam part 80 ... Multi-faced iron core printed wiring board 80a ... Front surface 80b ... Back side FC ... Flat cable (flat type parallel electric wire)
R ... curved portion _{S 1, S} 2 _... sagging face _{S 3} ... shear plane X ... Bari

Claims (4)

A rotary table driving device mounted with a small motor for rotating the rotary table and electronic components on the front side of the metal-core printed wiring board obtained by performing a counterbore press on the front side and then performing a punching press from the back side,
On the front side of the metal core printed wiring board, a flat cable is connected,
A rotating table driving device, wherein a back surface side of the metal core printed wiring board is mounted on a chassis so as to overlap with the chassis.   2. The rotary table driving device according to claim 1, wherein the flat cable is bent in a bent shape toward the lower side on the back side of the lifting base.   3. The rotary table driving device according to claim 1, wherein a back surface of the metal core printed wiring board is mounted on a lifting base constituting a part of the chassis. A motor device in which a small motor and electronic components are mounted on the front side of a metal core printed wiring board obtained by performing a counterbore press on the front side and then performing a punching press from the back side,
A motor device, wherein the back surface side of the metal core printed wiring board is mounted on a chassis so as to overlap.

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