JP2009080907A - Optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive which is improved so that a flexible flat cable fixed to the mounting surface on the back of the traverse chassis is not broken just before a section folded at a right angle. <P>SOLUTION: In the optical disk drive, a flexible flat cable 6 extending back from the optical pickup 4 toward the back of the traverse chassis 2 is folded at a right angle to fix the folded section 6a and its neighboring section to the mounting surface 20a along the back of the traverse chassis. The mounting surface 20a on the back of the traverse chassis formed on a slope gradually tapered from the back end to the front. The curvature of the cable 6 just before the folded section 6a is increased by the inclined mounting surface 20a and the bending stress concentration is reduced to prevent the cable breakage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus such as a DVD and a CD, and more particularly to an optical disc apparatus improved so that a flexible flat cable of an optical pickup is not disconnected.

  5 is a schematic partial bottom view of a conventional optical disk device, FIG. 6 is a schematic cross-sectional view of a conventional traverse chassis on which a turntable and an optical pickup are mounted, and FIG. 7A is a flexible flat cable of the conventional traverse chassis turned upside down. FIG. 7B is a partial cross-sectional view taken along line AA of FIG.

  As shown in FIGS. 5 to 7, the conventional optical disc apparatus is provided with a turntable 3 that is rotated by a spindle motor M at the front end portion of the traverse chassis 2, and an optical pickup 4 at the rear side of the turntable 3 of the traverse chassis 2. Is mounted so as to be movable back and forth along the two guide shafts 5. Then, the flexible flat cable 6 extending rearward from the optical pickup 4 is routed to the back side of the traverse chassis 2 and is folded so that the cable 6 bends at a right angle, and the folded portion 6a of the cable 6 and its vicinity 6b are connected to the traverse chassis. The cable 6 is attached to the horizontal mounting surface 2a on the back side, and the leading end of the cable 6 is pulled out to the side of the main chassis 1 and connected to a main wiring board (not shown).

  On the other hand, the flexible wiring board is pulled out from the top surface of the head device, and a tapered portion is formed at a corner of the top surface of the head device from which the flexible wiring board is pulled out, and flexible along the tapered portion from the top surface of the head device diagonally downward. There has been proposed a flexible wiring board connection system for a head device in which the wiring board is pulled out from the head device (Patent Document 1).

In addition, a small motor for driving the rotary table and electronic components are mounted, and a conductor pattern of the rotation control circuit is printed on the surface, and is formed near the edge of the metal core printed circuit board. Connected and fixed to the terminal pad row of the printed wiring, the stripped terminal row at one end is connected and fixed, and the other end is bent to the back side of the lifting member that goes up and down with the metal core printed circuit board mounted and connected to the body fixing member In the rotary table driving device provided with a flat cable, a double-sided adhesive tape bonded to an inner region from the terminal pad row of the surface of the metal core printed circuit board is provided, and one end side of the flat cable is warped. It is bent back and bonded to the double-sided adhesive tape, and the stripped terminal row is fixed to the terminal pad row on the outside of the metal core printed circuit board. It has also been proposed rolling table drive device (Patent Document 2).
JP 2000-251421 A JP-A-10-27460

  However, if the mounting surface 2a on the back side of the traverse chassis to which the folding portion 6a of the flexible flat cable 6 is attached is formed in a horizontal plane without a gradient as in the conventional optical disc apparatus shown in FIGS. As shown by the line, when the optical pickup 4 moves forward (turntable side), the flexible flat cable 6 bends sharply with a large curvature at the immediately preceding portion 6c of the rigid folded portion 6a, and a large bending stress is applied to the immediately preceding portion 6c. Due to the concentration, a large bending stress repeatedly acts on the immediately preceding portion 6c of the flexible flat cable 6 as the optical pickup 4 moves back and forth, and there is a risk of disconnection at the immediately preceding portion 6c.

  On the other hand, in the flexible wiring board connection method of Patent Document 1, along the tapered portion formed at the corner of the upper surface of the head device, the folded loop of the flexible wiring board 6 is difficult to contact the back surface of the covering plate. Since the flexible wiring board is drawn obliquely downward, the above problem cannot be solved even if such a technique is applied.

  In addition, the rotary table driving device of Patent Document 2 also elastically biases the flat cable in a direction away from the metal core printed circuit board by the spring back by the bent portion of the flat cable, and the flat cable is connected to the sharp edge of the circuit board. Since it is intended to prevent disconnection due to contact, the above problem cannot be solved even if such a technique is applied.

  The present invention has been made under the circumstances described above, and the problem to be solved is to provide an optical disc apparatus improved so that the flexible flat cable of the optical pickup is not disconnected immediately before the right-folded folded portion. is there.

  In order to solve the above problems, an optical disc apparatus according to the present invention is provided with a turntable at the front end portion of a traverse chassis, and an optical pickup is mounted on the rear side of the traverse chassis so as to be movable back and forth, and rearward from the optical pickup. In the optical disk apparatus in which the flexible flat cable extending to the back side of the traverse chassis is folded so that the cable bends at a right angle in the middle, and the folded part in the middle of the cable and its vicinity are attached to the mounting surface on the back side of the traverse chassis. The mounting surface on the rear side of the traverse chassis is formed as an inclined surface that gradually decreases from the rear end toward the front.

  In the optical disc apparatus of the present invention, it is preferable that the mounting surface on the rear side of the traverse chassis is formed as an inclined surface by gradually building up from the rear end toward the front, and the mounting surface formed on the inclined surface Is preferably 1/10 or more and 2/10 or less.

  In addition, it is preferable that the folded portion of the flexible flat cable and the vicinity thereof are overlapped with the attachment surface on the back side of the traverse chassis, and only the vicinity is attached to the attachment surface. It is preferable that it is stuck.

  When the mounting surface on the rear side of the traverse chassis is formed on an inclined surface that gradually decreases from the rear end toward the front as in the optical disk device of the present invention, when the optical pickup moves forward, the flexible flat cable The curvature of the portion immediately before the folded portion becomes smaller in accordance with the slope of the inclined mounting surface, and the immediately preceding portion is not sharply bent, so that the concentration of bending stress on the immediately preceding portion is alleviated. Accordingly, since the bending stress is not repeatedly concentrated on the immediately preceding portion of the flexible flat cable as the optical pickup 4 moves back and forth, the possibility that the flexible flat cable is disconnected at the immediately preceding portion of the folded portion can be eliminated.

  The mounting surface on the rear side of the traverse chassis may be gradually built up from the rear end toward the front to form an inclined surface, or conversely, the meat is gradually cut from the front toward the rear end to form an inclined surface. However, if the inclined surface is formed by scraping the meat as in the latter case, the flexible flat cable connection between the rear end of the mounting surface and the optical pickup is increased by the height of the rear end of the mounting surface. Since the vertical distance from the part is reduced, the amount of bending of the flexible flat cable is increased, and the load of the mounting part of the flexible flat cable is increased, so that an inclined surface can be formed by building up like the former. preferable.

  The slope of the mounting surface is preferably 1/10 or more and 2/10 or less. With this degree of slope, the curvature of the portion immediately before the folded portion of the flexible flat cable becomes an appropriate size and the bending stress is concentrated. Can be relaxed.

  In addition, the folded portion of the flexible flat cable and the vicinity thereof are overlapped on the mounting surface on the back side of the traverse chassis, and the optical disk apparatus in which only the vicinity is attached to the mounting surface has a degree of freedom of the unattached folding portion. Largely, this folding part can absorb the forward tension of the flexible flat cable and reduce the load on the attached vicinity part, especially when this neighboring part is attached in a bowl shape Also, since the vicinity portion has a certain degree of freedom, the load can be further reduced.

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

  1 is a plan view showing an optical disk apparatus according to an embodiment of the present invention with a disk tray omitted, FIG. 2 is a schematic bottom view of the optical disk apparatus, and FIG. 3 is equipped with an optical pickup and a turntable of the optical disk apparatus. FIG. 4A is a schematic cross-sectional view of the traverse chassis, FIG. 4A is a perspective view of a flexible flat cable mounting portion of the traverse chassis turned upside down, and FIG. 4B is a partial cross-sectional view along the line BB.

  As shown in FIG. 1, this optical disk apparatus has a synthetic resin traverse chassis 2 inside a synthetic resin main chassis 1 and swings up and down using mounting screws 7a and rubber dampers 7b on both sides of the rear end. As shown in FIGS. 1 and 3, a turntable 3 that is rotated by a spindle motor M is provided at the front end portion of the traverse chassis 2. Each optical pickup 4 is mounted.

  The turntable 3 is fixed to the output shaft of a spindle motor M attached to the front end of the traverse chassis 2, and when the traverse chassis 2 rotates upward, the turntable 3 and the clamper 9 directly above the turntable 3. The optical disk is rotated with a central opening edge of the optical disk interposed therebetween. The clamper 9 is rotatably held by a clamper holding portion 1b at the center of the bridge portion 1a formed integrally with the main chassis 1.

  The optical pickup 4 is mounted so as to move in the front-rear direction (direction approaching or moving away from the turntable 3) along the guide shafts 5 and 5 by a pinion 8 meshing with the rack 4a. The optical disk is irradiated with a laser beam from the objective lens 4b while approaching the turntable 3 to perform recording / reproduction. Then, as shown in FIGS. 2 and 3, the flexible flat cable 6 extending rearward from the optical pickup 4 is routed to the back side of the traverse chassis 2 and is folded so that the cable 6 bends at a right angle in the middle. The folded portion 6 a of the cable 6 and the vicinity portion 6 b thereof are attached to the attachment surface 20 a on the back side of the traverse chassis 2. The mounting surface 20a will be described in detail later.

  The front end of the traverse chassis 2 is formed with two convex portions 2c and 2d protruding forward, and a cam slider 10 made of synthetic resin provided with a cam groove 10a into which the convex portions 2c and 2d are respectively inserted. The main chassis 1 is attached to the front frame portion 1c so as to be slidable left and right. When the rack 10b at the right end of the cam slider 10 is engaged with the drive pinion 11 and the cam slider 10 slides in the left direction L, the convex portions 2c and 2d of the traverse chassis 2 descend while sliding in the cam groove. Therefore, the traverse chassis 2 rotates downward, and when the cam slider 10 slides in the right direction R, the traverse chassis 2 rotates upward.

  A disc tray (not shown) on which an optical disc is loaded and inserted is disposed between the traverse chassis 2 and the bridge portion 1a of the main chassis 1 so as to be slidable in the front-rear direction inside the main chassis 1. The disc tray is inserted and ejected when the pinion meshes with the rack on the back of the disc tray and rotates.

  In the above optical disk apparatus, in the closed state of FIG. 1 in which the optical disk is placed on the disk tray and inserted, the traverse chassis 2 rises, the optical disk is sandwiched between the turntable 3 and the clamper 9 and rotates, and the optical pickup 4 While moving toward the turntable 3 along the guide shafts 5 and 5, the optical disk is irradiated with a laser beam, and recording / reproduction is performed. When recording / reproduction on the optical disk is completed, the rack 10b of the cam slider 10 is engaged with the drive pinion 11, the cam slider 10 slides in the left direction L, and the traverse chassis 2 rotates downward to turn the turntable 3. The chuck of the optical disk by the clamper 9 is released, and the optical disk is placed on the disk tray and ejected.

  A major feature of the optical disk device is the attachment surface 20a on the back side of the traverse chassis 2 to which the folded portion 6a of the flexible flat cable 6 of the optical pickup 4 and the vicinity portion 6b thereof are attached.

  That is, as shown in FIGS. 3 and 4 (a) and 4 (b), the mounting surface 20a is gradually lowered from the rear end to the front, and gradually lowered from the rear end to the front. The slope of the mounting surface 20a is set to 1/10 or more and 2/10 or less. 4 (a) and 4 (b), the mounting surface 20a looks like an inclined surface that gradually increases from the rear end toward the front. However, FIGS. 4 (a) and 4 (b) show an inverted traverse chassis. 2 is a partial perspective view of FIG. 2 and a cross-sectional view taken along the line B-B, so that the mounting surface 20a is inclined so as to gradually become lower from the rear end toward the front.

  And the folding part 6a of the flexible flat cable 6 and its vicinity part 6b are piled up on the said attachment surface 20a of a traverse chassis back side, and only the vicinity part 6b is affixed on the attachment surface 20a with an adhesive agent or double-sided adhesive tape (not shown). Has been. A region 2c of the mounting surface 20a to which the vicinity portion 6b is attached has a bowl shape as shown by hatching in FIG. Reference numeral 2b denotes a positioning bank portion for positioning the folded portion 6a of the flexible flat cable 6.

  As described above, when the mounting surface 20a on the back side of the traverse chassis 2 is formed on an inclined surface that gradually decreases from the rear end toward the front, the optical pickup 4 moves forward as indicated by a virtual line in FIG. The curvature of the front portion 6c of the folded portion 6a of the flexible flat cable 6 becomes smaller in accordance with the slope of the inclined mounting surface 20a and the front portion 6a is not bent sharply. Stress concentration will be relaxed. Accordingly, since the bending stress does not repeatedly concentrate on the front portion 6a of the flexible flat cable 6 as the optical pickup 4 moves back and forth, the possibility that the flexible flat cable 6 is disconnected at the front portion 6c of the folded portion 6b is eliminated. can do.

  The mounting surface 20a on the back side of the traverse chassis 2 may be formed in an inclined surface by gradually cutting the meat from the front toward the rear end. In this case, as described above, the rear end of the mounting surface 20a The vertical distance between the rear end of the mounting surface 20a and the flexible flat cable connection portion (connector portion) of the optical pickup 4 is reduced by the amount of increase in the height of the cable, and the amount of flexure of the flexible flat cable 6 is increased. Since the load applied to the vicinity 6b of the flexible flat cable 6 is increased, it is preferable that the inclined surface is formed by building up as described above.

  Further, when the slope of the mounting surface 20a is 1/10 or more and 2/10 or less as described above, the curvature of the portion 6c immediately before the folded portion 6a of the flexible flat cable 6 becomes an appropriate size, and bending stress is reduced. Concentration can be relaxed, but when the gradient is less than 1/10, the curvature of the immediately preceding portion 6c is not much different from the conventional case, so the effect of preventing disconnection is insufficient, and conversely, when the gradient exceeds 2/10 When the optical pickup 4 moves rearward, the portion 6c immediately before the folded portion 6a of the flexible flat cable 6 is likely to be bent in an inverted “<” shape, so that the effect of preventing disconnection is still insufficient.

  Although both the folded portion 6a and the vicinity portion 6b of the flexible flat cable 6 may be attached to the attachment surface 20a on the back side of the traverse chassis 2, if only the vicinity portion 6b is attached as described above, it is not attached. The folding part 6a has a large degree of freedom, and this folding part 6a has an advantage of absorbing the forward tension of the flexible flat cable 6 and reducing the load on the adhered neighboring part 6b. In particular, if the adhering region 2c of the neighboring portion 6b is a bowl-shaped region, the neighboring portion 6b also has a certain degree of freedom, so that there is an advantage that the load can be further reduced. In addition, if the positioning bank part 2b is formed in the attachment surface 20a, the folding part 6a of the flexible flat cable 6 can be easily positioned accurately and attached along the positioning bank part 2b.

1 is a plan view showing an optical disc apparatus according to an embodiment of the present invention with a disc tray omitted. It is a schematic bottom view of the same optical disk device. It is a schematic sectional drawing of the traverse chassis which mounts the optical pick-up and turntable of the optical disk device. (A) is a perspective view of the flexible flat cable attachment part of the traverse chassis turned upside down, (b) is the BB line fragmentary sectional view. It is a general | schematic partial bottom view of the conventional optical disk apparatus. It is a schematic sectional drawing of the traverse chassis which mounts the conventional turntable and the optical pick-up. (A) is a perspective view of the flexible flat cable attachment part of the conventional traverse chassis turned upside down, (b) is the AA partial fragmentary sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main chassis 2 Traverse chassis 2a Horizontal mounting surface 20a Mounting surface formed in the inclined surface 3 Rotary table 4 Optical pick-up 6 Optical pick-up flexible flat cable 6a Folding part 6b Near part 6c Immediate part

Claims (5)

A turntable is provided at the front end of the traverse chassis, and an optical pickup is mounted on the rear side of the traverse chassis so that the optical pickup can move back and forth. In the optical disk apparatus in which the cable is folded so as to be bent at a right angle, and the folded part in the middle of the cable and the vicinity thereof are attached to the attachment surface on the back side of the traverse chassis,
An optical disc apparatus characterized in that the mounting surface on the rear side of the traverse chassis is formed on an inclined surface that gradually decreases from the rear end toward the front.   2. The optical disc apparatus according to claim 1, wherein the mounting surface is formed as an inclined surface by gradually building up from the rear end toward the front.   The optical disc apparatus according to claim 1 or 2, wherein a gradient of the mounting surface formed on the inclined surface is 1/10 or more and 2/10 or less.   The optical disk apparatus according to any one of claims 1 to 3, wherein a folded portion of the flexible flat cable and a vicinity thereof are overlapped with the attachment surface, and only the vicinity is attached to the attachment surface.   The optical disc apparatus according to claim 4, wherein the vicinity of the flexible flat cable is attached in a bowl shape.

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