JP2007200465A - Optical pickup feed mechanism for disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide optical pickup feed mechanism in which flexible flat cable does not collide with an edge of an insertion hole of a printed circuit board, and the like, an abnormal noise is not made and repeated stress of heavy load is not applied to the flexible flat cable in the optical pickup feed mechanism in which the optical pickup and a connector, arranged in a reverse side of a printed circuit board, are connected by the flexible flat cable. <P>SOLUTION: Above the surface of a printed circuit board 3, an optical pickup 1, to be driven reciprocally in a straight line direction, and a connector 5, arranged in the reverse side of the printed circuit board, are connected by the flexible flat cable 4, and the flexible flat cable 4 is inserted into an insertion hole 3a arranged in the printed circuit board 3, and is bent into a U shape. A trailing edge, positioned outside the U shape of the insertion hole 3a, is made to be inclined in order to retract from both sides to the center. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk device, and more particularly to an optical pickup feeding mechanism thereof.

  An example of an optical pickup feeding mechanism of a disk apparatus such as a conventional CD player or optical disk recording / reproducing apparatus will be described with reference to FIGS. As shown in FIG. 8, guide rods 2 and 2 are inserted into the optical pickup 1 and are driven to reciprocate along the guide rods 2 and 2 above the printed circuit board 3 by a mechanism not shown.

  The optical pickup 1 and the connector 5 are connected by a flexible flat cable 4. That is, one end of the flexible flat cable 4 is connected to the optical pickup 1 by soldering or the like, bent into a U shape, and inserted through the insertion hole 3a of the printed circuit board, and the other end of the flexible flat cable 4 is disposed on the back surface of the printed circuit board. Connected to the connector 5.

  The flexible flat cable 4 is a resin sheet printed with a conductor or a long and narrow conductor plate sandwiched between resin sheets and is flexible. When saved, it may warp to bend in the width direction. Although the direction of warping is not constant, it may be warped so that the outer surface of the U-shape is concave as shown in FIG.

  By the way, since it cannot bend if it is warped in the width direction, the warp is once corrected and flattened at the portion that bends in a U-shape. Accordingly, as the optical pickup 1 is sent, the warped portion moves along the longitudinal direction.

  In order to bend in a warped state, the convex part becomes long, so in order to become flat, the central part in the width direction shrinks or the end part becomes long, but actually the shrunk part or the stretched part Will shift in the longitudinal direction.

  In this way, since the optical pickup 1 moves, the U-shaped portion having a large curvature moves. If the U-shaped outer part is convex, smooth movement is possible, but conversely, if the U-shaped outer part is concave as shown in FIG. The deformation state of the cable changes rapidly. This can be easily confirmed by bending a flexible sheet such as paper, bending it into a U shape, and moving the bent portion.

  FIG. 10A shows a state in which the optical pickup 1 has moved to the right. In this case, as shown in FIG. 10B, the portion that contacts the insertion hole 3a of the printed board 4 of the flexible flat cable 4 is shown. Warped. When the optical pickup 1 moves leftward as shown in FIG. 10C, the contact portion with the insertion hole 3a of the flexible flat cable 4 becomes flat in the width direction as shown in FIG. Comes into contact with the insertion hole 3 a of the printed circuit board 4.

  When this state change occurs suddenly, the central portion in the width direction of the flexible flat cable 4 collides with the edge of the insertion hole 3a of the printed circuit board 4 to generate an abnormal noise, which degrades the quality of the product. In addition, a large stress change occurs with the rapid change of the flexible flat cable 4. If a large stress change is repeated for a long time, the flexible flat cable 4 may be deteriorated and further damaged.

  In the optical disk drive mechanism proposed in Japanese Patent Laid-Open No. 2003-36614, a flexible printed circuit board (FPC) 2 that connects the optical pickup 1 and a connector 8 disposed on the back surface of the printed circuit board 7 is bent into a U-shape. 7 holes 7a are inserted. The shield plate 9 covering the upper surface of the printed board 7 on the rear side from the rear edge of the hole 7a is in contact with the flexible printed board 2.

  In this optical disk drive mechanism, the trailing edge of the hole 7a of the printed circuit board 7 is a straight line perpendicular to the width direction of the flexible printed circuit board 2, and the shield plate 9 folds the flat plate along a straight line perpendicular to the width direction of the flexible printed circuit board 2. Since they are formed by bending, they do not have a function of attaching bending ridges that cause the flexible printed circuit board 2 to bend the U-shaped outside.

Therefore, when the flexible printed circuit board 2 warps so that the outer side of the U-shape is concave, an abnormal noise that collides between the flexible printed circuit board 2 and the rear edge of the hole 7a or the shield plate 9 is generated as in the conventional example described above. In addition, if a repeated load of a large stress is applied to the flexible printed circuit board 2 for a long period of time, the flexible printed circuit board 2 may be damaged.
Japanese Unexamined Patent Publication No. 2003-36614, paragraph 0006, FIG. 1 and FIG.

  The present invention has been made in view of the above points, and the object is to fix the both ends of the flexible flat cable with the optical pickup and the fixing member provided on the back surface of the plate-like support member. In an optical pickup feeding mechanism in which a flat cable is inserted into an insertion hole provided in a plate-like support member and bent into a U-shape, the flexible flat cable collides with the edge of the insertion hole of the plate-like support member and noise is generated. In addition, the present invention provides an optical pickup feeding mechanism in which a repeated stress of a large load is not applied to a flexible flat cable.

  In the optical pickup feeding mechanism of the disk device according to the present invention, the optical pickup which is driven back and forth in the linear direction above the surface of the plate-like support member and the fixing member provided on the back surface of the plate-like support member fix both ends of the flexible flat cable. In the optical pickup feeding mechanism in which the flexible flat cable is inserted into an insertion hole provided in the plate-like support member and bent into a U-shape, trailing edges located outside the U-shape of the insertion hole are on both sides. It is inclined so as to recede toward the center.

  Further, the optical pickup feeding mechanism of the disk device according to the present invention is such that the optical pickup that is reciprocally driven in the linear direction above the surface of the plate-like support member and the fixing member provided on the back surface of the plate-like support member are both ends of the flexible flat cable. In the optical pickup feeding mechanism in which the flexible flat cable is inserted into an insertion hole provided in the plate-like support member and bent into a U-shape, a rear edge located outside the U-shape of the insertion hole Is inclined with respect to the moving direction of the optical pickup.

  Further, the optical pickup feeding mechanism of the disk device according to the present invention is such that the optical pickup that is reciprocally driven in the linear direction above the surface of the plate-like support member and the fixing member provided on the back surface of the plate-like support member are both ends of the flexible flat cable. In the optical pickup feeding mechanism in which the flexible flat cable is inserted into an insertion hole provided in the plate-like support member and bent into a U-shape, a rear edge located outside the U-shape of the insertion hole An optical pickup feeding mechanism for a disk device, wherein a notch having a width narrower than a width of the flexible flat cable is provided.

  Further, the optical pickup feeding mechanism of the disk device according to the present invention is such that the optical pickup that is reciprocally driven in the linear direction above the surface of the plate-like support member and the fixing member provided on the back surface of the plate-like support member have both ends of the flexible flat cable In the optical pickup feeding mechanism in which the flexible flat cable is inserted into an insertion hole provided in the plate-like support member and bent into a U shape, the U of the insertion hole is formed on the surface of the plate-like support member. A streak-like projection is provided in a direction extending in the moving direction of the optical pickup from the rear edge located outside the character shape.

  Further, the optical pickup feeding mechanism of the disk device according to the present invention is such that the optical pickup that is driven back and forth in the linear direction above the surface of the plate-like support member and the fixing member provided on the back surface of the plate-like support member connect the both ends of the flexible flat cable. In the optical pickup feeding mechanism that is fixed and is bent into a U-shape through the insertion hole provided in the plate-like support member, the U-shape of the insertion hole is formed on the surface of the plate-like support member. A recess having an inclined surface in which a cross section in a direction perpendicular to the moving direction of the optical pickup is lowered toward the center from the rear edge located on the outer side of the optical pickup is provided.

  According to the optical pickup feeding mechanism of the present invention, the flexible flat cable does not collide with the edge of the insertion hole of the plate-like support member and no abnormal noise is generated, and a repetitive stress of a large load is applied to the flexible flat cable. There is nothing.

  The best mode for carrying out the present invention will be described below with reference to examples.

  1A is a plan view showing an optical pickup feeding mechanism according to Embodiment 1 of the present invention, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. It is a partial enlarged plan view showing a feed mechanism. As shown in FIG. 1, guide rods 2 and 2 are inserted into the optical pickup 1 and are reciprocated along the guide rods 2 and 2 above the printed circuit board 3 by a mechanism not shown.

  The optical pickup 1 and the connector 5 are connected by a flexible flat cable 4. The flexible flat cable 4 may be a so-called FPC (flexible printed circuit) in which a plurality of strip conductors are printed in parallel on a resin sheet, or may be formed by sandwiching a plurality of strip conductors between resin sheets.

  One end of the flexible flat cable 4 is connected to the optical pickup 1 by soldering or the like, and further bent into a U shape and inserted through the insertion hole 3a of the printed circuit board, and the other end of the flexible flat cable 4 is disposed on the back surface of the printed circuit board. Connected to the connector 5.

  As shown in FIG. 1 (a) or FIG. 1 (c), a V-shaped notch is formed at the rear edge of the insertion hole 3a of the printed board. Since the flexible flat cable 4 is flexible, even if it is not initially warped, if it is stored for a long time at a high temperature, it may warp so as to bend in the width direction. However, since the flexible flat cable 4 has elasticity, when it is bent into a U shape, it is pressed against the rear edge of the insertion hole 3a of the printed circuit board as shown in FIG.

  For this reason, the flexible flat cable 4 is deformed and warped so that the U-shaped outer surface becomes convex as shown in FIG. As the optical pickup 1 moves, the U-shaped portion moves and the warped portion becomes flat in the width direction. As described above, the flexible flat cable 4 is repeatedly deformed. However, if the U-shaped outer surface is convex as described in the prior art, the deformation changes smoothly and the repeated stress is reduced.

  FIG. 3A shows a state in which the optical pickup 1 has moved to the right. In this case, as shown in FIG. 3B, the portion that contacts the insertion hole 3a of the printed board 4 of the flexible flat cable 4 is shown. The U-shaped outer surface is warped so as to be convex.

  When the optical pickup 1 moves to the left as shown in FIG. 3C, the portion of the flexible flat cable 4 that comes into contact with the insertion hole 3a of the printed circuit board 4 bends and is flat in the width direction as shown in FIG. However, the deformation state is smoothly changed, and the central portion of the flexible flat cable 4 is merely separated from the edge of the insertion hole 3a of the printed circuit board 4, and no abnormal noise is generated due to the collision.

  As described above, in the optical pickup feeding mechanism according to the first embodiment, even when a thin flexible flat cable that easily warps is used, no abnormal noise is generated with the movement of the optical pickup. There is no risk of breakage due to repeated repeated stress.

  4A is a schematic cross-sectional view showing a main part of an optical pickup feeding mechanism according to Embodiment 2 of the present invention, and FIG. 4B is a cross-sectional view showing a contact state of members of the optical pickup feeding mechanism. 4 (c) is a schematic plan view showing a main part of the optical pickup feeding mechanism.

  In the optical pickup feeding mechanism according to the second embodiment, the rear edge of the insertion hole 6a of the pickup support chassis 6 is linear, but the surface of the pickup support chassis 6 has a streak 6b from the rear edge of the insertion hole 6a to the rear. 6b is formed. Other configurations are the same as those of the first embodiment.

  In this example, as shown in FIG. 4B, both ends of the flexible flat cable 4 are pushed up by the streaky protrusions 6b and 6b in a state where the flexible flat cable 4 is pressed against the pickup support chassis 6, and the flexible flat cable 4 is U-shaped. The same effect as that of the first embodiment can be obtained by adding a warp wrinkle having a convex outer surface.

  FIG. 5A is a schematic cross-sectional view showing a main part of an optical pickup feeding mechanism according to Embodiment 3 of the present invention, and FIG. 5B is a cross-sectional view showing a contact state of members of the optical pickup feeding mechanism. FIG. 5C is a schematic plan view showing a main part of the optical pickup feeding mechanism.

  In the optical pickup feeding mechanism of the third embodiment, the rear edge of the insertion hole 6a of the pickup support chassis 6 is linear, but a V-shaped dent is formed on the surface of the pickup support chassis 6 from the rear edge of the insertion hole 6a toward the rear. 6c is formed. Other configurations are the same as those of the first embodiment.

  In this example, as shown in FIG. 5B, the flexible flat cable 4 is pressed against the recess 6 c in a state where the flexible flat cable 4 is pressed against the pickup support chassis 6, and the U-shaped outer surface is convex to the flexible flat cable 4. The same effect as Example 1 is acquired.

  6 is a schematic plan view showing a main part of an optical pickup feeding mechanism according to Embodiment 4 of the present invention. In the optical pickup feeding mechanism of the fourth embodiment, a notch having a width narrower than the width of the flexible flat cable 4 is provided at the rear edge of the insertion hole 3a of the printed circuit board 3. Other configurations are the same as those of the first embodiment.

  In this example, both sides of the flexible flat cable 4 are pressed against the printed circuit board 3 in a state where the flexible flat cable 4 is pressed against the printed circuit board 3, and the flexible flat cable 4 is warped with a U-shaped outer surface protruding. The same effect as in Example 1 can be obtained.

  FIG. 7 is a schematic plan view showing the main part of an optical pickup feeding mechanism that is Embodiment 5 of the present invention. In the optical pickup feeding mechanism of the fifth embodiment, the rear edge of the insertion hole 3 a of the printed board 3 is inclined with respect to the longitudinal direction of the flexible flat cable 4. Other configurations are the same as those of the first embodiment.

  In this example, one side of the flexible flat cable 4 is pressed against the printed circuit board 3 in a state where the flexible flat cable 4 is pressed against the printed circuit board 3, and the flexible flat cable 4 is warped with a U-shaped outer surface protruding. Although the warpage is not necessarily symmetrical, the same effect as in the first embodiment can be obtained.

  The embodiment is configured as described above, but the invention is not limited to this. For example, the rear edge of the insertion hole provided in the printed circuit board or the pickup support chassis may be inclined in a curved shape. The streak and the dent provided on the surface of the chassis or the like may be formed in a curved surface. Furthermore, when the flexible flat cable is connected to a connector away from the insertion hole, the flexible flat cable may be fixed with a fixing member such as a double-sided tape in the vicinity of the insertion hole so that the flexible flat cable does not hang down.

1A is a plan view showing an optical pickup feeding mechanism according to Embodiment 1 of the present invention, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. It is a partial enlarged plan view showing a feed mechanism. It is a perspective view explaining the effect | action of the optical pick-up feed mechanism. 3A is a schematic cross-sectional view showing a state 1 of the main part of the optical pickup feeding mechanism, FIG. 3B is a view in the direction of arrow A in FIG. 3A, and FIG. FIG. 3D is a schematic cross-sectional view showing another state of the part, and FIG. 3D is a view in the direction of arrow B in FIG. 4A is a schematic cross-sectional view showing a main part of an optical pickup feeding mechanism according to Embodiment 2 of the present invention, and FIG. 4B is a cross-sectional view showing a contact state of members of the optical pickup feeding mechanism. 4 (c) is a schematic plan view showing a main part of the optical pickup feeding mechanism. FIG. 5A is a schematic cross-sectional view showing a main part of an optical pickup feeding mechanism according to Embodiment 3 of the present invention, and FIG. 5B is a cross-sectional view showing a contact state of members of the optical pickup feeding mechanism. FIG. 5C is a schematic plan view showing a main part of the optical pickup feeding mechanism. It is a schematic plan view which shows the principal part of the optical pick-up feed mechanism which is Example 4 of this invention. It is a schematic plan view which shows the principal part of the optical pick-up feeding mechanism which is Example 5 of this invention. 8A is a plan view showing an example of a conventional optical pickup feeding mechanism, FIG. 8B is a cross-sectional view taken along line AA in FIG. 8A, and FIG. 8C shows the optical pickup feeding mechanism. It is a partial enlarged plan view. It is a perspective view explaining the effect | action of the optical pick-up feed mechanism. 10A is a schematic cross-sectional view showing a state 1 of the main part of the optical pickup feeding mechanism, FIG. 10B is a view taken in the direction of the arrow A in FIG. 10A, and FIG. FIG. 10D is a schematic cross-sectional view showing another state of the part, and is a view in the direction of arrow B in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up 2 Guide rod 3 Printed circuit board, 3a Insertion hole, 3b Streaks, 3c Depression 4 Flexible flat cable 5 Connector 6 Pickup support chassis 6, 6a Insertion hole, 6b Streaks, 6c Depression

Claims (5)

An optical pickup reciprocally driven in a linear direction above the surface of the plate-like support member and a fixing member provided on the back surface of the plate-like support member fix both ends of the flexible flat cable, and the flexible flat cable is the plate-like In an optical pickup feeding mechanism that is bent into a U-shape through an insertion hole provided in a support member, a rear edge located outside the U-shape of the insertion hole is inclined so as to recede from both sides toward the center. An optical pickup feeding mechanism for a disk device. An optical pickup reciprocally driven in a linear direction above the surface of the plate-like support member and a fixing member provided on the back surface of the plate-like support member fix both ends of the flexible flat cable, and the flexible flat cable is the plate-like In the optical pickup feeding mechanism that is bent into a U-shape through an insertion hole provided in the support member, a rear edge located outside the U-shape of the insertion hole is inclined with respect to the optical pickup moving direction. An optical pickup feeding mechanism for a disc device. An optical pickup reciprocally driven in a linear direction above the surface of the plate-like support member and a fixing member provided on the back surface of the plate-like support member fix both ends of the flexible flat cable, and the flexible flat cable is the plate-like In the optical pickup feeding mechanism that is bent into a U-shape through an insertion hole provided in the support member, a notch having a width narrower than the width of the flexible flat cable is formed at the rear edge of the insertion hole located outside the U-shape. An optical pickup feeding mechanism for a disk device, comprising: An optical pickup reciprocally driven in a linear direction above the surface of the plate-like support member and a fixing member provided on the back surface of the plate-like support member fix both ends of the flexible flat cable, and the flexible flat cable is the plate-like In the optical pickup feeding mechanism that is bent into a U-shape through an insertion hole provided in the support member, the movement direction of the optical pickup from the rear edge located outside the U-shape of the insertion hole on the surface of the plate-like support member An optical pickup feeding mechanism for a disk device, characterized in that a streak-like protrusion is provided in a direction extending in the direction. An optical pickup reciprocally driven in a linear direction above the surface of the plate-like support member and a fixing member provided on the back surface of the plate-like support member fix both ends of the flexible flat cable, and the flexible flat cable supports the plate-like support In an optical pickup feeding mechanism that is bent into a U-shape through an insertion hole provided in a member, light is emitted from the rear edge located outside the U-shape of the insertion hole toward the rear side on the surface of the plate-like support member. An optical pickup feeding mechanism for a disk device, comprising a recess having an inclined surface whose cross section perpendicular to the moving direction of the pickup becomes lower toward the center.

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