JP2008052851A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device mounted with a disk clamper which can easily fit and integrate a clamper bottom and a clamper top by small force across a magnet and is satisfactory in assembly workability. <P>SOLUTION: The optical disk device supports a disk clamper 5 freely rotatably in a clamper support section 6a above a turntahle 4, in which a locking claw piece 51c having elasticity is formed in an annular projecting part 51b of the clamper bottom 51 of the disk clamper 5, a section 52c to be locked is formed in a root portion of an annular projecting part 52b of the clamper top 52, and a slope 52e for guiding the locking claw piece is formed on an inner side face of the annular projecting part 52b. When assembling the clamper bottom 51 and the clamper top 52 via the magnet 53, the locking claw piece 51c is guided up to the section 52c to be locked with elastic deformation along the slope 52e for guiding the locking claw piece and is easily locked therewith and therefore, the assembly workability is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that performs recording / reproduction on an optical disc such as a DVD or a CD, and more particularly, to an optical disc apparatus having an improved disc clamper that chucks an optical disc.

  In a conventional general optical disk apparatus, a traverse chassis on which an optical pickup and a turntable are mounted is attached to the main chassis so that it can be turned up and down on both sides of its rear end, and a disk clamper is disposed above the turntable to The clamper support part is rotatably supported. Then, when the optical disk is placed on the tray and sent between the turntable and the disk clamper, the traverse chassis is rotated upward by the cam slider, and the optical disk is held between the turntable and the disk clamper so that the center opening edge of the optical disk is sandwiched The optical disk is irradiated with a laser beam from the optical pickup while recording / reproduction is performed.

  Various types of disk clampers are known to be mounted on such an optical disk device, and one of them is formed on the upper surface of the clamper bottom by sandwiching a magnet between the clamper bottom and the clamper top. The annular projection formed on the lower surface of the clamper top and the annular projection formed on the lower surface of the clamper top are fitted to each other, and a locking claw piece formed on the annular projection of the clamper bottom is formed at the base of the annular projection of the clamper top There are some that are integrated by being locked to the locked portion.

  However, the above-mentioned disc clamper can lock the locking claw piece to the locked portion if the annular convex portion of the clamper bottom and the annular convex portion of the clamper top are fitted with each other, if they are not press-fitted very strongly. In addition, if the mutual positional relationship between the locking claw piece and the locked portion is slightly shifted, the locking claw piece cannot be locked to the locked portion. There was a problem that it was not good.

  On the other hand, a magnet is sandwiched between a clamper body having a peripheral wall having an engaging claw formed on the outer peripheral surface and a lid having a peripheral wall having an engaging claw that engages with the engaging claw. Has been proposed (Patent Document 1). However, this disc clamper engages the engaging claws by rotating the peripheral walls after fitting the peripheral wall, lid and peripheral wall of the clamper body at a position where both engaging claws do not hit. Therefore, the assembling workability is not so good, and when the clamper main body and the lid body rotate relatively during use, there is a problem that the engagement of the engaging claws is disengaged and disassembled.

There is also known a disk drive device in which a plurality of locking portions of a clamper are elastically deformed and inserted into and locked in a support hole of a clamp arm to attach the clamper to the clamp arm (Patent Document 2). However, this disk drive device does not improve the assembling workability of the clamper itself, and it is necessary to press-fit considerably strongly in order to insert and lock the clamp portion of the clamper into the support hole of the clamp arm. Therefore, it cannot be said that the assembling property is good.
JP 2004-185774 A JP 2003-173597 A

  The present invention has been made under the above circumstances, and the problem to be solved is that the clamper bottom and the clamper top can be easily integrated with a small force with a magnet interposed therebetween, and the assembly workability is good. An object of the present invention is to provide an optical disc apparatus equipped with a disc clamper.

  In order to solve the above-mentioned problems, an optical disc apparatus according to the present invention has a traverse chassis, on which an optical pickup and a turntable are mounted, attached to the main chassis so as to be vertically rotatable on both sides of the rear end, and a disc clamper is disposed above the turntable. An optical disk apparatus disposed and rotatably supported by a clamper support portion of a main chassis, wherein the disk clamper is an annular formed on an upper surface of a clamper bottom with a magnet interposed between the clamper bottom and the clamper top The annular projection formed on the lower surface of the clamper top and the convex portion are fitted to each other, and a plurality of elastic claw pieces formed on any one of the annular projections are attached to the base of the other annular projection. It is locked and integrated with the locked part formed in the part, and this locked part is the root part On the side surface of the formed annular projection, an inclined surface for guiding the locking claw piece is formed so that the wall thickness of the annular projection decreases as it approaches the tip of the annular projection from the locked portion of the base portion. It is characterized by that.

  In the optical disk device of the present invention, it is preferable to leave the non-inclined side surface of the annular convex portion between the locked portion of the base portion of the annular convex portion and the inclined surface for guiding the locking claw piece, It is preferable that the inclination angle with respect to the vertical direction of the inclined surface for guiding the locking claw piece is 10 ° to 45 °.

  The optical disk apparatus of the present invention is preferably a traverse chassis having an optical pickup and a turntable mounted on the main chassis on both sides of the rear end so as to be pivotable up and down, and a disk clamper is disposed above the turntable. An optical disc apparatus that is rotatably supported by a clamper support portion of a chassis, wherein the disc clamper includes an annular convex portion formed on an upper surface of the clamper bottom with a magnet interposed between the clamper bottom and the clamper top. A plurality of engaging claw pieces having elasticity formed on the annular convex portion of the clamper bottom are fitted to the inner side of the annular convex portion formed on the lower surface of the clamper top, and are attached to the base portion of the annular convex portion of the clamper top. The clamp part is integrated with the part to be locked. Is an angle of 10 ° to 45 ° with respect to the vertical direction so that the wall thickness of the annular convex portion decreases toward the inner surface of the annular convex portion from the locked portion of the base portion toward the tip of the annular convex portion. And an inclined side surface of the annular convex portion is left between the inclined surface for guiding the locking claw piece and the locked portion, and the clamper The bottom is cut into the annular projection on both sides of the locking claw piece to make the locking claw piece independent of the annular projection, and the thickness of the locking claw piece is made thinner than the thickness of the annular projection. It is characterized by being.

  Like the disc clamper mounted on the optical disc apparatus of the present invention, the ring-shaped convex portion becomes closer to the end of the ring-shaped convex portion on the side surface of the ring-shaped convex portion formed at the base portion of the portion to be locked. When the inclined surface for guiding the locking claw piece is formed so as to reduce the wall thickness, it is formed on the other annular convex portion when the annular convex portions of the clamper bottom and the clamper top are fitted. The latching claw pieces are smoothly elastically deformed while sliding on the slopes for guiding the above-mentioned latching claw pieces and are guided to the to-be-latched portion, so that they are easily locked. Therefore, the clamper bottom and the annular convex part of the clamper top can be fitted and integrated with a small pressure input, and there is no need for troublesome alignment between the locking claw piece and the locked part. Assembling workability of the optical disc apparatus is greatly improved, and it is possible to contribute to improvement of production efficiency and reduction of production cost of the optical disk apparatus.

  And what left the non-inclined side face of the annular convex part between the locked part of the base part of the annular convex part and the slope for guiding the locking claw piece is not to leave the side face. In comparison, the resin molding becomes easier, the generation rate of defective molding is reduced, and the effect that the life of the molding die is extended is obtained. In addition, when the angle of the inclined surface for guiding the locking claw pieces is set to 10 ° to 45 ° with respect to the vertical direction, the inclined claw pieces are easily elastically deformed while smoothly sliding on the inclined surface. Since it can be guided to the engaging portion, an effect that the assembling workability is further improved can be obtained.

  Further, as in a more desirable optical disk apparatus, the annular claw piece is cut on both sides of the claw piece on the clamper bottom so that the engagement claw piece is independent from the annular projection, and the thickness of the engagement claw piece is annular. In addition to the above-mentioned effects, the claw pieces that are thinner than the thickness of the projections are more elastically deformed, so the clamper bottom and clamper top annular projections can be fitted with a smaller pressure input. The effect that they can be integrated is obtained.

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

  FIG. 1 is a schematic plan view showing an optical disk apparatus according to an embodiment of the present invention with the disk tray omitted, and FIG. 2 is a schematic partial sectional view of the apparatus in a state where the turntable is lowered and the optical disk is not chucked. 3 is a schematic partial cross-sectional view of the apparatus in a state where the turntable is raised and the optical disk is chucked between the disk clamper, FIG. 4 is an exploded perspective view of the disk clamper mounted on the apparatus, and FIG. The clamper top of the disk clamper is shown, (a) is a plan view thereof, (b) is a sectional view taken along the line A-A, and (c) is a bottom view thereof. 6A and 6B show a clamper bottom of the disk clamper, wherein FIG. 6A is a plan view thereof, FIG. 6B is a sectional view taken along line BB, and FIG. 7 is an enlarged partial sectional view of the clamper top. is there.

  As shown in FIG. 1, this optical disk apparatus has a synthetic resin traverse chassis 2 attached to a synthetic resin main chassis 1 so as to be pivotable up and down by supporting shafts 2a and 2a on both sides of the rear end. As shown in FIGS. 2 and 3, a spindle motor 3 is mounted on the front portion of the traverse chassis 2, and a magnetic body 4a is placed on the central raised portion 4b on the output shaft 3a of the spindle motor 3. The turntable 4 provided in is fixed. A disc clamper 5 is disposed above the turntable 4. As shown in FIG. 1, the disc clamper 5 is provided with a clamper support hole in the central portion of the metal plate 6 laid horizontally on the upper side of the main chassis 1. 6a (see FIG. 4) is rotatably attached. A disk tray (not shown) is disposed between the turntable 4 and the disk clamper 5 and is attached to the inside of the main chassis 1 so as to be able to advance and retract. The disk clamper 5 will be described in detail later.

  As shown in FIG. 1, the optical pickup 7 is mounted on the traverse chassis 2 so as to move in the direction of approaching / separating from the turntable 4 along the parallel guide rods 8a and 8b. The optical pickup 7 irradiates the optical disc with a laser beam through the objective lens 7a while moving in a direction approaching the turntable 4. A cam slider 9 is attached to the front edge portion of the main chassis 1, and the cam slider 9 slides in the left-right direction by a pinion gear 9b that meshes with a rack 9a at one end (right end in FIG. 1). It is like that. The cam groove of the cam slider 9 is engaged with the engagement protrusion 2b at the front end of the traverse chassis 2. When the cam slider 9 slides left and right, the engagement protrusion 2b moves in the cam groove. Thus, the traverse chassis 2 rotates in the vertical direction around the support shafts 2a, 2a on both sides of the rear end.

  In the optical disk apparatus as described above, when the optical disk is placed on a disk tray (not shown) and sent between the turntable 4 and the disk clamper 5 in a state where the turntable 4 and the disk clamper 5 are separated as shown in FIG. Then, the cam slider 9 slides to the left by the pinion gear 9b, and the traverse chassis 2 rotates upward. As shown in FIG. 3, the center opening edge of the optical disc D is sandwiched between the disc clamper 5 and the turntable 4. Rotate. Then, while the optical pickup 7 moves along the guide rods 8a and 8b in a direction approaching the turntable 4, a laser beam is irradiated onto the optical disk D through the objective lens 7a, and recording / reproduction is performed. When the recording / reproduction is completed, the optical disk D is taken out of the optical disk apparatus by the reverse operation.

  As shown in FIG. 4, the disc clamper 5 which is a major feature of this optical disc apparatus comprises a synthetic resin clamper bottom 51, a synthetic resin clamper top 52 and a magnet 53. As shown in FIGS. 4 and 6, the clamper bottom 51 of the disc clamper 5 is formed by forming an annular convex portion 51b on the upper surface of a substantially donut plate-like bottom plate 51a having an opening at the center. The part 51b is formed with three locking claw pieces 51c having an outward locking claw at the upper end with an angular interval of 120 °. Then, cuts 51d are provided in the annular projections 51b on both sides of each locking claw piece 51c to make each locking claw piece 51c independent of the annular projection 51b, and the thickness of each locking claw piece 51c is changed to an annular projection. Each locking claw piece 51c can be easily elastically deformed by making it thinner than the wall thickness of 51b. Further, a thick annular rib 51e is formed on the outer peripheral portion of the bottom surface of the bottom plate 51a of the clamper bottom 51. As shown in FIG. 3, the annular rib 51e and the annular rib 4c on the upper surface of the outer peripheral portion of the turntable 4 are formed. Thus, the central opening edge of the optical disk D is firmly held.

  On the other hand, as shown in FIGS. 4 and 5, the clamper top 52 is formed on the lower surface of the disc-shaped top plate 52 a with an annular protrusion 52 b fitted outside the annular protrusion 51 b of the clamper bottom 51, A bearing cylinder portion 52f into which the shaft end of the output shaft 3a of the spindle motor 3 is inserted is formed, and three substantially rectangular openings are formed in the corresponding portion of the top plate 52a corresponding to the root portion of the annular convex portion 52b. By forming 52d at an angular interval of 120 °, three locked portions 52c for locking the locking claw pieces 51c of the clamper bottom 51 are formed at the base portion of the annular convex portion 52b at an angular interval of 120 °. It is provided with a gap. And on the inner side surface of this annular convex part 52b, there are three inclined parts so that the thickness of the annular convex part 52a decreases as it approaches the tip (lower end) of the annular convex part 52b from the locked part 52c of the base part. The inclined surface 52e for engaging claw piece guidance is formed with an angular interval of 120 °, and the portion where the inclined surface 52e is formed is a shallow guide groove.

  An angle θ (see FIG. 7) with respect to the vertical direction of the inclined surface 52e for guiding the locking claw piece is preferably in the range of 10 ° to 45 °. When the inclined surface 52e having such an inclination angle is formed, the clamper bottom When the annular projection 51b of 51 is fitted and integrated inside the annular projection 52b of the clamper top 52, the locking claw piece 51c of the clamper bottom 51 slides smoothly along the slope 52e, It is easily elastically deformed and can be locked to the locked portion 52c very easily.

  The locking claw piece guiding inclined surface 52e may be formed so as to be continuous with the locked portion 52c, but as shown in FIG. 7, the locked portion 52c and the locking claw piece guiding inclined surface 52e In the meantime, it is preferable to leave the non-inclined inner side surface 52g of the annular convex portion 52b. If a part of the inner side surface 52g is left in this way, resin molding becomes easier as compared with the case where the inner side surface is not left, the generation rate of defective molding is reduced, and the life of the molding die is increased. There are advantages.

  Further, on the top plate 52a of the clamper top 52, three magnet pressing pieces 52h formed by U-shaped cutouts are disposed at an angular interval of 120 °, and the annular convex portion 51b of the clamper bottom 51 is provided. By pressing the magnets 53 housed in the protrusions 52 with the protrusions 52i on the lower surface of the tip of each pressing piece 52h, the magnets 5 are prevented from jumping or rattling.

  The magnet 53 magnetically attaches the disk clamper 5 to the turntable 4 provided with the magnetic body 4a in order to hold the optical disk D between the turntable 4 and the disk clamper 5. A donut plate-like magnet 53 having an outer diameter and a thickness fitted into the annular convex portion 52b of the clamper bottom 51 and an inner diameter through which the bearing tube portion 52f of the clamper top 52 can be inserted is used.

  As shown in FIGS. 2 and 4, the assembly work of the disk clamper 5 including the clamper bottom 51, the clamper top 52 and the magnet 53 as described above is performed by the clamper of the metal plate 6 horizontally mounted on the upper side of the main chassis 1. The annular protrusion 52b of the clamper top 52 is loosely fitted into the support hole 6a from above, and the locking claw piece guide inclined surface 52e of the clamper top 52 and the locking claw piece 51c of the clamper bottom 51 are aligned. The annular protrusion 51b of the clamper bottom 51 in which the magnet 53 is fitted is press-fitted and fitted into the inside of the annular protrusion 52b of the clamper top 52 from below the clamper support hole 6a of the metal plate 6. When press-fitted and fitted in this way, the locking claw piece 51c is elastically deformed while sliding on the locking claw piece guide inclined surface 52e and is guided to the locked portion 52c, and is easily and smoothly locked. Therefore, the clamper bottom and the annular convex portions 51b and 52b of the clamper top can be fitted and integrated with a small pressure input, and it takes time to align the locking claw piece 51c and the locked portion 52c. As a result, the assembly workability of the disk clamper is greatly improved. Therefore, the disk device employing the disk clamper 5 is extremely advantageous because it improves the production efficiency and reduces the production cost.

  When the disc clamper 5 assembled as described above is in a non-chucked state in which the turntable 4 is lowered as shown in FIG. 2, the outer peripheral edge of the top plate 52a of the clamper top 52 is the clamper support hole 6a of the metal plate 6. 3, while the turntable 4 is in a chucked state in which the turntable 4 is lifted as shown in FIG. 3, the disk clamper 5 is lifted slightly, and the top plate of the clamper top 52 is supported. Both 52a and the bottom plate 51a of the clamper bottom 51 can be rotated without contacting the periphery of the clamper support hole 6a.

  In the above embodiment, the annular convex portion 51b of the clamper bottom 51 is fitted inside the annular convex portion 52b of the clamper top 52. On the contrary, the annular convex portion 51b of the clamper bottom 51 is connected to the clamper. The inclined surface 52e for guiding the locking claw piece may be formed on the outer surface of the annular convex portion 52b of the clamper top 52 so as to be fitted to the outer side of the annular convex portion 52b of the top 52. Further, in the above embodiment, the locking claw piece 51c is formed on the clamper bottom 51 and the locked portion 52c is formed on the clamper top 52. On the contrary, the locking claw is formed on the clamper top 52. A piece may be formed, and the locked portion may be formed on the clamper bottom 51. As described above, the optical disk apparatus of the present invention can accept various modifications.

1 is a schematic plan view showing an optical disc apparatus according to an embodiment of the present invention with a disc tray omitted. FIG. 3 is a schematic partial cross-sectional view of the apparatus in a state where the turntable is lowered and the optical disk is not chucked. FIG. 3 is a schematic partial cross-sectional view of the apparatus in a state where the turntable is raised and the optical disk is chucked between the turntable and the disk clamper. It is a disassembled perspective view of the disc clamper mounted in the apparatus. The clamper top of the disk clamper is shown, (a) is a plan view thereof, (b) is a sectional view taken along the line A-A, and (c) is a bottom view thereof. The clamper bottom of the disk clamper is shown, (a) is a plan view thereof, and (b) is a sectional view taken along the line BB. It is an expanded partial sectional view of the clamper top.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main chassis 2 Traverse chassis 2a Supporting shaft part 4 Turntable 5 Disc clamper 51 Clamper bottom 51b Clumper bottom annular convex part 51c Locking claw piece 51d Cut 52 Clamper top 52b Clamper top annular convex part 52c Locked part 52e Engagement Slope for guiding toe pawl 52g Inner side surface of annular projection not inclined 53 Magnet 6a Clamper support hole (clamper support part)
7 Optical pickup 9 Cam slider

Claims (4)

A traverse chassis equipped with an optical pickup and turntable is mounted on the main chassis so that it can be turned up and down on both sides of the rear end. An optical disc device,
In the above disk clamper, a magnet is sandwiched between the clamper bottom and the clamper top, and the annular protrusion formed on the upper surface of the clamper bottom is fitted inside the annular protrusion formed on the lower surface of the clamper top. A plurality of elastic locking claw pieces formed on the annular convex portion of the clamper bottom are integrated by engaging with a locked portion formed at the base portion of the annular convex portion of the clamper top. ,
The clamper top has an angle of 10 ° to 45 ° with respect to the vertical direction so that the wall thickness of the annular convex portion decreases on the inner surface of the annular convex portion from the locked portion of the base portion toward the tip of the annular convex portion. An inclined surface for guiding the locking claw piece inclined at an angle is formed, and a non-inclined side surface of the annular convex portion is left between the inclined surface for guiding the locking claw piece and the locked portion. ,
The clamper bottom cuts the annular projection on both sides of the locking claw piece so that the locking claw piece is independent of the annular projection, and the thickness of the locking claw piece is made thinner than the thickness of the annular projection. An optical disc apparatus characterized by that. A traverse chassis equipped with an optical pickup and turntable is mounted on the main chassis so that it can be turned up and down on both sides of the rear end. An optical disc device,
The disc clamper has a magnet sandwiched between a clamper bottom and a clamper top, and an annular projection formed on the upper surface of the clamper bottom and an annular projection formed on the lower surface of the clamper top are fitted together. A plurality of elastic claw pieces having elasticity formed on one of the annular convex portions are integrated by being engaged with a locked portion formed on the base portion of the other annular convex portion. A locking claw that is inclined on the side surface of the annular convex portion formed at the root portion so that the thickness of the annular convex portion decreases from the locked portion of the root portion toward the tip of the annular convex portion. An optical disc apparatus characterized in that a slope for one guide is formed.   The non-inclined side surface of the annular convex portion remains between the locked portion of the base portion of the annular convex portion and the inclined surface for guiding the locking claw piece. Optical disk device. 4. The optical disk apparatus according to claim 2, wherein an inclination angle of the inclined surface for guiding the claw piece with respect to a vertical direction is 10 [deg.] To 45 [deg.].

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