JP3843111B2 - Motor equipment - Google Patents

Description

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

For example, some rotary table driving devices such as compact disc (CD) players employ a loading method in which a rotary table floats up from below a disc medium inserted in the horizontal direction and fits into a disc hole. is there. As shown in FIGS. 7 and 8, such a rotary table elevating type driving device is equipped with a small motor (spindle motor, brushless motor) 2 for driving the rotary table 1 and an electronic component P, and the rotation of the motor 2. An iron core printed circuit board 3 on which the conductor pattern of the control circuit is printed on the surface, and a terminal pad line 4 on one end of the printed wiring terminal pad line 4 formed near the edge of the metal core printed circuit board 3. Is connected and fixed, and is connected to the connector 8a of the body fixing member 8 by bending the other end 6 to the back side of the elevating base 7 on which the iron core printed circuit board 3 is mounted. Flexible flat parallel electric wires) FC.

  The stripped terminal row 5 is fixed to the terminal pad row 4 with solder 9, but the curved portion of the flat cable FC with respect to the up and down movement of the metal core printed circuit board 3 attached to the up and down base 7 is about 5 to 7 mm. In order to suppress the peeling force applied to the solder 9 by the spring back by R, an adhesive 10 is placed on the stripped 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 moved up and down by an actuator (not shown) along the guide column 7a. In order to suppress the tilt (surface inclination) of the disk surface as much as possible, management of flatness is strongly demanded on the mounting surface (back surface) of the iron core printed circuit board 3. By the way, the iron core printed circuit board 3 is an iron core printed wiring board in which an insulating layer 3b such as resin or enamel is deposited on an iron core board (base board) 3a and a predetermined conductor pattern 4 is printed. The iron core printed wiring board that is used is shear-separated by punching press (punch) from the back of a multi-sided metal core printed wiring board in which a conductor pattern is repeatedly printed on the surface in one or two dimensions. Is obtained. Therefore, the back surface of the iron core printed circuit board 3 is a sag surface side. Note that a resist ink 11 is applied on the conductor pattern 4.

  However, when the back surface side of the iron core printed circuit board 3 is a sag surface, the front surface inevitably has a fractured surface, so that a sharp burr X is generated at the front edge of the iron core printed circuit board 3. The curved portion R of the flat cable FC is likely to come into contact with the burr X due to the up-and-down movement of the iron core printed circuit board 3, and the flat cable FC may be disconnected.

  Therefore, in the assembly process of the rotary table driving device, when the iron core printed circuit board 3 is mounted on the chassis 13, the iron core printed circuit board 3 and the end faces of the chassis 13 The flat cable FC is fixed with the adhesive tape 12. Since one end of the flat cable FC is clamped by the adhesive tape 12, the flat cable FC does not hit the edge of the iron core printed circuit board 3 when the iron core printed circuit board 3 moves up and down. Can be prevented.

  However, since the flat cable FC inevitably moves when the iron core printed circuit board 3 moves up and down, the adhesive tape 12 itself is easy to peel off. In particular, the vicinity of the edge of the iron core printed circuit board 3 that is a bent portion of the adhesive tape 12 Since there is virtually no expectation of adhesion at this point, there was still a risk of disconnection of the flat cable FC.

  Therefore, in view of the above problems, an object of the present invention is to provide a rotary table drive device that suppresses tilting (surface inclination) of the rotary table and suppresses the risk of disconnection of the flat cable.

  In order to solve the above-mentioned problems, the rotary table driving device according to the present invention provides a rotary table driving device on the front side of a metal core printed wiring board obtained by punching the front side and then punching the back side. A rotary table driving device mounted with a small motor and electronic components, wherein a flat cable is connected to the front surface side of the metal core printed wiring board, and the back surface side of the metal core printed wiring board is mounted on the chassis. It is characterized by that.

  In the rotary table driving device according to the present invention, when a countersunk press is performed in advance on the surface side of the metal core printed wiring board, the front edge becomes a sag surface. The cross-section burrs and the like are within the plate thickness and do not protrude from the surface, and the flat cable can be prevented from being disconnected. And since the back surface side of the metal core printed wiring board which is maintaining high flatness is piled up and attached on a chassis, the parallelism of a turntable is securable.

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

  FIG. 1A is a side view showing a rotary table drive device according to an embodiment of the present invention, FIG. 1B is an enlarged view showing a connecting 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.

  The rotary table driving device used for the CD drive, CD-ROM drive, etc. of this example is equipped with a small motor (spindle motor, brushless motor) 2 for driving the rotary table 1 and an electronic component P, and a rotation control circuit for the motor 2. The core exposed printed circuit board 3 having the conductor pattern printed on the surface and the terminal pad array 4 of the printed wiring formed near the edge of the metal core printed circuit board 30 are connected to the stripped terminal array 5 at one end. A flat cable (flexible) which is fixedly connected and connected to the connector 8a of the fuselage fixing member 8 by flexing the other end 6 to the back side of the elevating base 7 on which the iron core printed circuit board 3 is placed. Flat type parallel electric wire) FC.

  A rectangular double-sided adhesive tape 40 is bonded to an inner region of the surface of the iron core printed circuit board 30 in this example from the terminal pad row 4. One end side of the flat cable FC is bent and bent, and the bent portion 5 a is bonded to the double-sided adhesive tape 40, and the stripped terminal row 5 extends outward from the iron core printed circuit board 30 and the terminal pad row 4. It is fixed with solder 9.

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

  When the elevating base 7 is moved up and down, the curved portion R of the flat cable FC approaches and separates from the front side edge of the iron core printed circuit board 30, but the bent portion 5a in which one end side of the flat cable FC is warped and Therefore, the pull-out flat cable FC itself is elastically biased in a direction away from the iron core printed circuit board 30 by the spring back by the portion 5a, so that the front side edge of the iron core printed circuit board 30 is provided. It is difficult to touch. For this reason, disconnection of the flat cable FC can be prevented.

  In addition, since one end side of the flat cable FC is bonded to the inner region from the terminal pad row 4 with the double-sided adhesive tape 40, when the coated stripped terminal row 5 is soldered to the terminal pad row 4, the terminal is fixed due to the temporarily fixed state. Misalignment does not occur, and poor connection can be resolved. Furthermore, even after soldering, the bent portion 5a of the flat cable FC is difficult to peel off due to the adhesive force of the double-sided adhesive tape 40. Therefore, even when tensile stress is generated on the flat cable FC, the solder of the terminal pad row 4 is effectively peeled off. Can be prevented.

  The iron core printed circuit board 30 of this example has a protrusion 50 for a cable stopper. Before the bent portion R of the flat cable FC hits the front side edge of the iron core printed circuit board 30, the flat cable FC is sacrificed to the cable stopper projection 50 on the side. It becomes difficult to hit the front side 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 formed at the same time with the aid of the conductor pattern printing formation process, and the solder pile 54 can be melted and fixed on the base conductor pad 52 at the time of solder connection, without increasing the number of processes. That's it.

  4A is a longitudinal 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.

  A cable wound body 65 inserted into the inner peripheral side of the bent portion 5a on one end side of the flat cable FC is fixed to the iron core printed circuit board 60. The cable wound body 65 includes a pair of stand pins 65a to be inserted into the through holes and a beam portion 65b that is fixed to the top portion of the stand pin 65a and horizontally mounted thereon, and the bent portion 5a of the flat cable FC is wound around the beam portion 65b. It is like that.

  By attaching such a cable wound body 65, it is possible to avoid bending at the bent portion 5a of the flat cable FC and to prevent disconnection at that portion. In addition, even if an excessive tensile stress is applied to the flat cable FC, the cable wound body 65 blocks the spreading 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 side view showing still another iron core printed circuit board 70 used in the rotary table driving device.

  The cable stopper protrusion 75 of the iron core printed circuit board 70 of this example is a silk-printed thick film layer formed on the coating film of the resist ink 11. The cable stopper protrusion 75 can be formed by assisting a silk printing process in which a symbol character such as a production number is printed on the coating film of the resist ink 11. In such a case, it is not necessary to add the number of steps. In order to secure the thickness of the cable stopper protrusion 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.

  Burrs are formed on the front edge of each iron core printed circuit board 30, 60, 70 by a punching press (punch) from the back surface. The reason for punching from the back side is that high flatness of the back side is required to maintain parallelism when the chassis is mounted.

  6A to 6C are process diagrams showing a method for manufacturing an iron core printed wiring board.

First, a multi-sided iron core printed wiring board 80 in which a predetermined conductor pattern is repeatedly printed in a one-dimensional direction or a two-dimensional direction and formed on a surface is prepared. As shown in FIG. A counter press is applied to the surface 80a of the multi-face iron core printed wiring board 80 in accordance with a broken line). This counterbore press, as shown in FIG. 6 (b), the press edge surface 80a side becomes sagging face S _1. Next, 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 There is a case where a burrs X appear between ₁ and the fracture surface. Since the burrs X of the fracture surface are within the plate thickness and do not protrude from the surface, the use of the iron core printed wiring board manufactured in this manner can prevent the flat cable from being disconnected.

  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, etc., but the aluminum core printed wiring board is used. Aluminum core printed circuit board can be used.

(A) is a side view which shows the turntable 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 used for the turntable drive device, and a flat cable. It is a top view which shows the iron core printed circuit board used for the rotary table drive device. It is a top view which shows the state which connected the flat cable 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, (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 rotary table drive device. (A) is a side view which shows an example of the conventional rotary table drive device, (b) is an enlarged view which shows the connection part of the iron core printed circuit board used for the rotary table drive device, and a flat cable. (A) is a top view which shows the iron core printed circuit board of a prior art example, (b) is the bottom view. It is an enlarged view which shows the connection part of the iron core printed circuit board used for the rotary table drive device of a prior art example, and a flat cable.

Explanation of symbols

1 ... Rotary table 2 ... Small motor for driving (spindle motor)
3, 30, 60, 70 ... Iron core printed circuit board 4 ... Terminal pad row 5 ... Stripped terminal row 5a at one end of flat cable ... Curved portion 6 ... Other end 7 of flat cable ... Lifting base 7a ... Guide pillar 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 stopper projection 52 ... Base conductor pad 54 ... Solder pile 65 ... Cable cover Winding body 65a ... Stand pin 65b ... Beam portion 80 ... Multi-faced iron core printed wiring board 80a ... Front surface 80b ... Back surface FC ... Flat cable (flat parallel wire)
R: Curved portion S ₁ , S ₂ ... Sag surface S ₃ ... Shear surface X ... Burr

Claims (4)

A rotary table driving device in which a small motor for driving a rotary table and an electronic component are mounted on the front side of a metal core printed wiring board obtained by punching the front side and then punching from the back side,
A flat cable is connected to the surface side of the metal core printed wiring board,
A rotary table driving device, wherein a rear surface side of the metal core printed wiring board is mounted on a chassis in an overlapping manner.   2. The rotary table driving device according to claim 1, wherein a back surface side of the metal core printed wiring board is attached to be overlapped on an elevating base constituting a part of the chassis.   The rotary table drive device according to claim 2, wherein the flat cable is bent in a bent shape toward the lower side of the back side of the lift base. A motor device in which a small motor and an electronic component are mounted on the surface side of a metal core printed wiring board obtained by performing a punching press on the front surface side and then performing a punching press from the back surface side,
A motor device, wherein a back surface side of the metal core printed wiring board is attached to be overlapped on a chassis.

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