JP2010140552A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device which improves a coupling structure between a wiring board and a flexible wiring board to enable regulation of height of an objective lens actuator, miniaturization of the flexible wiring board, and positioning of the fore end of the flexible wiring board. <P>SOLUTION: The optical pickup device is constructed by: mounting the wiring board 9 on a board mounting surface 7h of the objective lens actuator 7; disposing the edge of the flexible wiring board 8 for supplying power to movable sections 7a and 7f of the actuator 7 to be adjacent at a right angle to the lower end of the wiring board 9; and connecting the lands of the lower end of the wiring board 9 and the lands of the edge of the flexible wiring board 8 with a solder 11b. Then, it is not necessary to prepare a part for overlapping the wiring board 9 on the edge of the flexible wiring board 8, thereby enabling regulation of the height of the actuator and miniaturization of the flexible wiring board, and further enabling positioning in the height direction by preparing a supporting convex part 7p on the board mounting surface to support the edge of the flexible wiring board 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical pickup device mounted on an optical disk recording / reproducing device, and more particularly, a wiring board attached to an objective lens actuator, and a flexible wiring board that feeds power to a movable part of the objective lens actuator via the wiring board. The present invention relates to an optical pickup device having an improved connection structure.

  As one of the conventional optical pickup devices, the wiring board is attached to the board mounting surface of the objective lens actuator, and the tip part bent above the flexible wiring board that feeds power to the movable part of the objective lens actuator through the wiring board is described above. Known to be superposed on a wiring board and soldered.

  On the other hand, as an optical pickup device that is solder-connected without overlapping the front end portion of the flexible wiring board on the wiring board, a power supply board (wiring board) having a through hole is attached to a holding member having a groove, and the flexible wiring board Is bent 180 °, the terminal portion at the tip is inserted into the groove of the holding member through the through hole of the power supply board, and the output terminal electrode of the flexible wiring board and the input terminal electrode of the power supply board are soldered. It has been proposed (Patent Document 1).

There has also been proposed an optical pickup device in which a connection terminal is provided at the end of a plurality of elastic wires that support the movable part of the objective lens actuator, and the connection terminal and the land at the tip of the flexible wiring board are directly soldered (patent) Reference 2).
Japanese Patent Laid-Open No. 2002-279622 JP-A-8-124194

  However, in the conventional optical pickup device described above, it is difficult to reduce the area of the tip portion of the flexible wiring board to be overlaid on the wiring board, so that it is difficult to suppress the height of the objective lens actuator and to reduce the size of the flexible wiring board. was there.

  On the other hand, in the optical pickup device of Patent Document 1, since it is necessary to form through holes and grooves in the power supply substrate and the holding member, the processing becomes complicated, and the power supply substrate in which the through holes are formed is inevitably. Since the size is increased, it is still difficult to suppress the height of the objective lens actuator. In addition, this optical pickup device has a problem that a tension is generated because the flexible wiring board is bent by 180 °, causing disconnection.

  On the other hand, the optical pickup device of Patent Document 2 can omit the wiring board, but the connection terminals provided at the end portions of the plurality of elastic wires that support the movable portion of the objective lens actuator, and the distal end portion of the flexible wiring board The operation of directly soldering the lands is extremely troublesome because the position of the tip portion of the flexible wiring board is not fixed, and there is a problem that workability is poor.

  The present invention has been made under the above circumstances, and the problems to be solved include that it is possible to suppress the height of the objective lens actuator, downsize the flexible wiring board, and position the tip of the flexible wiring board. Thus, an object of the present invention is to provide an optical pickup device having an improved connection structure between a wiring board and a flexible wiring board.

  In order to solve the above problems, an optical pickup device according to the present invention attaches a wiring board (PCB) to a board mounting surface of an objective lens actuator (ACT), and feeds power to a movable part of the objective lens actuator via the wiring board. A front end portion of a flexible wiring board (FPC) is arranged close to the lower end of the wiring board at a right angle, and a land formed at the lower end portion of the wiring board and a land formed at the front end portion of the flexible wiring board. Is characterized by soldering.

  In the optical pickup device of the present invention, the support convex portion is formed along the lower end of the wiring substrate on the substrate mounting surface of the objective lens actuator, and the height direction is formed by supporting the tip portion of the flexible wiring board on the support convex portion. It is preferable to perform positioning. And it is preferable to insert the front-end | tip of a flexible wiring board in the clearance gap between the lower end of a wiring board, and a support convex part. Furthermore, it is also preferable to form a shallow concave portion on the upper surface of the support convex portion, and to insert the tip portion of the flexible wiring board into the concave portion for positioning in the lateral direction.

  As in the optical pickup device of the present invention, the tip of the flexible wiring board is arranged close to the lower end of the wiring board at right angles, and the land formed at the lower end of the wiring board and the tip of the flexible wiring board are formed. When soldered lands are soldered, it is not necessary to form an overlapping part on the wiring board at the tip of the flexible wiring board and to superimpose it on the wiring board as in the past, so the height of the wiring board is reduced and the objective lens is reduced. It is possible to suppress the height of an actuator (hereinafter simply referred to as an actuator). The reduction in the height dimension of the wiring board is difficult when a through hole for inserting a flexible wiring board is formed in the wiring board as in Patent Document 1, but in the present invention, such a through hole is provided in the wiring board. Since it is not formed, the reduction of the height dimension is easy. Since the flexible wiring board is also reduced in size so that there is no overlapping portion, it is possible to increase the number of sheets taken from the FPC material sheet when the flexible wiring board is manufactured.

  Further, an optical pickup device in which a support convex portion is formed along the lower end of the wiring board on the substrate mounting surface of the actuator, and the leading end portion of the flexible wiring board is supported on the support convex portion and positioned in the height direction, Since soldering of the land at the lower end of the wiring board and the land at the tip of the flexible wiring board can be performed easily and accurately, workability is improved and soldering defects are less likely to occur.

  The optical pickup device in which the tip of the flexible wiring board is inserted into the gap between the lower end of the wiring board and the supporting convex portion prevents the vertical movement of the tip of the flexible wiring board during soldering. Can be performed more easily and accurately.

  Furthermore, in the optical pickup device in which a shallow concave portion is formed on the upper surface of the support convex portion and the distal end portion of the flexible wiring board is fitted in the concave portion and the lateral positioning is performed, the distal end portion of the flexible wiring board is not fixed when soldering. Since it is fixed not only in the vertical direction but also in the horizontal direction, the soldering operation can be performed more easily and accurately.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a plan view of an optical pickup device according to an embodiment of the present invention, FIGS. 2 to 4 are perspective views of an objective lens actuator mounted on the optical pickup device, and FIG. 2 is a wiring board and flexible wiring. 3 shows a state before the board is attached, FIG. 3 shows a state where the wiring board and the flexible wiring board are attached, and FIG. 4 shows a state where the lands of the attached wiring board and the flexible wiring board are soldered. FIG. 2 is a schematic partial sectional view of the actuator.

  The optical pickup device shown in FIG. 1 is mounted on an optical disk recording / reproducing device or the like, and a laser beam is applied to one side end (left side end in FIG. 1) of the back side of the metal slide base 1. A laser diode 2 for irradiation is mounted, and a diffraction grating 3 for diffracting the laser beam to generate three beams is mounted in front of the laser diode 2 (irradiation direction). In front of the diffraction grating 3, a beam splitter 4 that divides the beam into two parts by reflection and transmission and a rising mirror (not shown in FIG. 1) that reflects these beams upward are mounted. Further, a sensor lens 5 and a photodetector 6 are mounted on one side of the beam splitter 4.

  On the surface side of the slide base 1 is mounted an actuator 7 that performs focus control, track control, and tilt control of an objective lens 7a that focuses the beam and irradiates the optical disc, and the objective lens 7a serves as the rising mirror. Positioned to be directly above. Then, as will be described in detail later, the wiring board in which the tip of the flexible wiring board 8 for supplying power to the movable part of the actuator 7 (the holder that holds the objective lens 7a) is attached to the board mounting surface of the actuator 7 9 is soldered and connected.

  Further, bearings 10a and 10b are provided on both sides of the slide base 1, and these bearings 10a and 10b are slidably mounted on the two guide shafts (main shaft and sub shaft) of the optical disk recording / reproducing apparatus. It has become so.

  Such an optical pickup device irradiates the optical disc with a laser beam emitted from the laser diode 2 while moving toward the rotary table of the optical disc along the two guide shafts of the optical disc recording / reproducing device. Recording / reproducing is performed by detecting the reflected light by the photodetector 6. That is, the beam emitted from the laser diode 2 is diffracted into three beams by the diffraction grating 3, passes through the beam splitter 4, is reflected upward by the rising mirror, is condensed by the objective lens 7 a, and is irradiated onto the optical disk. The Then, the light reflected by the optical disk is reflected by the rising mirror through the objective lens 7a, reflected by the beam splitter 4, transmitted through the sensor lens 5, and detected by the photodetector 6. Playback is performed.

  A major feature of this optical pickup device is that the objective lens actuator 7, in particular, a wiring board 8 attached to the board mounting surface of the actuator 7, and a flexible wiring board 9 that feeds power to a movable part of the actuator 7 via this wiring board, In the connection structure.

  As shown in FIGS. 2 to 4, the actuator 7 has a wire holding member 7c attached and fixed on the actuator base 7b with an adhesive, and passes through the gel filling portions 7d on both sides of the wire holding member 7c. The lens holder 7f is supported by three wires 7e (6 on both sides) that protrude forward. In other words, the small substrate 7g is attached to the left and right side wall portions of the lens holder 7f, and the tips of the wires 7e are soldered to the lands of the small substrate 7g, so that the lens holder 7f is movable and the wires 7e. The rear end portion of the wire 7e penetrates the gel filling portions 7d on both sides of the wire holding member 7c, and the six lands on both sides of the wiring board 9 adhered to the rear end surface 7h of the wire holding member 7c with an adhesive. And fixed by solder 11a. The gel filling portion 7d absorbs unnecessary resonance of the wire 7e, and is filled with, for example, a silicone-based gel agent.

  A focusing coil 7i is fitted and adhered to the inside of the outer peripheral wall of the lens holder 7f, and a tracking coil 7j is attached to the front and rear outer wall surfaces of the outer peripheral wall. A tilting double coil (not shown in the figure) is attached to the lower surface of the lens holder 7f so as to surround the yoke insertion slot (not shown in the figure). The left and right yokes (not shown in the figure) rising from the actuator base 7b are loosely inserted from below. A pair of magnets 7k and 7k are disposed before and after the lens holder 7f, and are fixedly attached to the mounting pieces 7m and 7m that rise from the actuator base 7b.

  A pair of projections 7n and 7n for positioning the wiring board 9 are provided on the board mounting surface of the actuator 7, that is, the rear end face 7h of the wire holding member 7c. Further, a rectangular horizontal support convex portion 7p for positioning the flexible wiring board 8 is provided at the lower end of the rear end surface 7h so as to extend along the lower end of the wiring board 9 attached to the rear end surface 7h. A shallow groove-like recess 7q (see FIG. 2) for positioning the flexible wiring board 8 in the lateral direction is formed on the upper surface of the support projection 7p.

  The wiring board 9 is adhered to the rear end surface 7h of the wire holding member 7c with an adhesive in a state where the pair of positioning holes 9a and 9a are fitted and positioned in the pair of protrusions 7n and 7n. As described above, the rear ends of the six wires 7e that movably support the lens holder 7f are connected and fixed to the six lands on both sides of the wiring board 9 by the solder 11a. The flexible wiring board 8 for supplying power to the focusing, tracking and tilting coils of the movable part of the actuator 7 (lens holder 7f holding the objective lens 7a) through the wiring board 9 and the wire 7e. The front end portion is disposed close to the lower end of the wiring board 9 at a right angle, and the lower end of the wiring board 9 and the front end of the flexible wiring board 8 are connected by solder 11b.

  More specifically, as shown in FIG. 3, the distal end portion of the flexible wiring board 8 fits into the shallow concave portion 7q of the support convex portion 7p, is positioned in the lateral direction (left-right direction), and is supported by the support convex portion 7p. At the same time, the height of the flexible wiring board 8 is positioned so that the tip of the flexible wiring board 8 is positioned at the lower end of the wiring board 9 by the support projections 7p. As shown in FIG. The wiring board 9 is inserted into the gap between the lower end of the wiring board 9 and the concave portion 7q of the supporting convex portion 7n. The land (input terminal electrode) 9b formed at the lower end of the wiring board 9 and the land (output terminal electrode) 8a formed at the tip of the flexible wiring board 8 are connected by the bridge solder 11b.

  In the optical pickup device of the present invention, a wiring board 9 attached to the board attachment surface (rear end face 7h of the wire holding member 7f) of the actuator 7, and a flexible wiring board for supplying power to the movable portion of the actuator 7 via the wiring board 9 8 is connected with the above connection structure, it is not necessary to form an overlapping portion on the wiring board at the tip of the flexible wiring board and to overlap the wiring board as in the prior art. It is possible to reduce the height of the actuator 7 by reducing the height. Since the flexible wiring board 8 is also reduced in size so that there is no overlapping portion at the tip, it is possible to increase the number of FPC material sheets to be taken when the flexible wiring board 8 is manufactured, resulting in cost reduction. Become.

  Moreover, the front end portion of the flexible wiring board 8 is positioned in the height direction and the lateral direction by the support convex portion 7n and the shallow concave portion 7q, and further, the gap between the lower end of the wiring board 9 and the concave portion 7q of the support convex portion 7p. Since it is fixed vertically and horizontally by being inserted into the wiring board 9, soldering work between the land 9 b at the lower end of the wiring board 9 and the land 8 a at the tip of the flexible wiring board 8 can be performed easily and accurately. As a result, workability is improved and soldering defects are less likely to occur.

  In the above embodiment, the shallow concave portion 7q for positioning in the lateral direction is formed on the upper surface of the support convex portion 7p for positioning the flexible wiring board 8 in the height direction, but this shallow concave portion 7q is omitted. It doesn't matter.

1 is a plan view of an optical pickup device according to an embodiment of the present invention. It is a perspective view of the objective lens actuator mounted in the same optical pick-up apparatus, Comprising: The state before attaching a wiring board and a flexible wiring board is shown. It is a perspective view of the objective lens actuator mounted in the same optical pick-up apparatus, Comprising: The state which attached the wiring board and the flexible wiring board is shown. It is a perspective view of the objective lens actuator mounted in the same optical pick-up apparatus, Comprising: The state which soldered the land of the attached wiring board and the flexible wiring board is shown. FIG. 2 is a schematic partial cross-sectional view of the same actuator.

Explanation of symbols

7 Objective lens actuator 7a Objective lens (movable part)
7c Wire holding member 7e Wire 7f Lens holder (movable part)
7h Rear end surface of wire holding member (substrate mounting surface)
7p Supporting convex part 7q Shallow concave part 8 Flexible wiring board 8a Land 9 Wiring board 9b Land 11a, 11b Solder

Claims (4)

  A wiring board is attached to the board mounting surface of the objective lens actuator, and the tip of the flexible wiring board that feeds power to the movable part of the objective lens actuator through this wiring board is placed close to the lower end of the wiring board at a right angle, An optical pickup device, wherein a land formed at a lower end portion of the wiring board and a land formed at a front end portion of the flexible wiring board are soldered.   A support convex portion is formed along the lower end of the wiring board on the substrate mounting surface of the objective lens actuator, and the tip portion of the flexible wiring board is supported on the support convex portion to perform positioning in the height direction. The optical pickup device according to claim 1.   The optical pickup device according to claim 2, wherein the tip of the flexible wiring board is inserted into a gap between the lower end of the wiring board and the supporting convex portion.   4. The optical pickup according to claim 2, wherein a shallow concave portion is formed on the upper surface of the support convex portion, and a distal end portion of the flexible wiring board is fitted into the concave portion to perform lateral positioning.

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