JP2006344326A - Disk driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk driving device in which energizing force energizing a member converting rotary motion of a lead screw to a straight-line motion for a lead screw seldom be changed even if off-center adjustment and height adjustment of a pickup is performed. <P>SOLUTION: The disk driving device is provided with a spindle motor 2 fixed to a base, a pickup 3 guided by guide shafts 4, 5 fixed to the base, a feed motor 6, a lead screw 7 to be rotation-driven by the feed motor, a nut member 8 having teeth of almost straight line engaged with a groove of a spiral type of the lead screw, and a leaf spring energizing the teeth of the nut member for the lead screw, wherein the nut member is arranged so that the teeth become almost parallel to a recording plane of a disk and supported rotatably around an axis line of the guide shaft of one side so as to be slidable in the axis direction, the leaf spring is constituted so that it energizes the teeth of the nut member for the lead screw in the direction being almost orthogonal to the recording plane of the disk. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk drive device including a pickup feed mechanism that drives a pickup that performs recording and / or reproduction of information with respect to a disk in the radial direction of the disk.

  12 is a perspective view of the pickup feed mechanism of the disk drive device of Conventional Example 1, and FIG. 13 is a side sectional view of the pickup feed mechanism of FIG.

  In these figures, reference numeral 101 denotes a pickup for recording and reproducing information with respect to a disk (not shown), and two guide shafts 102 (only one is shown) fixed to a base (not shown). It has two bearings 101a and 101b that are guided so as to be movable in the radial direction and that are slidably engaged with one guide shaft 102 in the axial direction.

  Reference numeral 103 denotes a feed motor for driving the pickup 101 along the guide shaft 102. A lead screw 104 is connected to the rotation shaft of the feed motor 104, and the lead screw 104 has a spiral groove 104a on the outer periphery. A nut member 105 is fixed to the pickup 101, and the nut member 105 has a plurality of substantially linear teeth 105 a that engage with the spiral groove 104 a of the lead screw 104. Is converted into a linear motion along the guide shaft 102 of the pickup 101. When the feed motor 103 is driven, the pickup 101 slides along the guide shaft 102 to record and reproduce information on the disc.

  The teeth 105a of the nut member 105 are formed on one surface of a plate-like portion 105b. The plate-like portion 105b is substantially perpendicular to the recording surface of the disc and is a hinge that can be elastically deformed with respect to the main body 105c of the nut member 105. It is supported via a portion 105d and is urged by a spring 106 in a direction substantially parallel to the recording surface of the disc and substantially perpendicular to the guide shaft 102 (arrow E direction).

  14 is a plan view of the pickup feed mechanism of the disk drive device of Conventional Example 2 (Japanese Patent Laid-Open No. 01-25367), FIG. 15 is an enlarged view of a portion G in FIG. 14, and FIG. 17 is a cross-sectional view taken along the line II of FIG. In addition, the same code | symbol is attached | subjected to the same or similar part as the said prior art example 1, and the overlapping description is abbreviate | omitted.

In this mechanism, a pin 107 that engages with the groove 104 a of the lead screw 104 is attached to the pickup 101, and a leaf spring 108 is attached to the pickup 101 so that the lead screw 104 is sandwiched between the pin 107 and the lead screw of the leaf spring 108. By providing a means for adjusting the pressing force to 104, the step-out of the feed motor 103 is prevented.
Japanese Patent Laid-Open No. 01-25367

  In the pickup feed mechanism of Conventional Example 1, when the off-center adjustment of the pickup 101 is performed, the nut member 105 moves together with the pickup 101 in the direction of arrow F (see FIG. 13), and the distance between the lead screw 104 and the pickup 101 changes. Thus, the urging force of the spring 106 changes. Therefore, when the urging force of the spring 106 is small, the teeth 105a of the nut member 105 are easily detached from the lead screw 104. Conversely, when the urging force of the spring 106 is large, the load of the feed motor 103 is increased. There was a problem.

  Further, the pickup feed mechanism of the above-described conventional example 2 is such that the pickup 101 is guided by a single guide shaft 102 and a lead screw 104 so as to be slidable in the feed direction. It is different from what is guided by the guide shaft.

  In such a mechanism, the pressing force of the leaf spring 108 against the lead screw 104 does not change when the off-center adjustment of the pickup 101 is performed, but the pressing force of the leaf spring 108 changes when the height is adjusted. To do. For this reason, it is necessary to adjust the pressing force of the leaf spring 108, which takes time and effort.

  The present invention has been made in view of the above-described problems, and its purpose is to use as a lead screw a member that converts the rotational movement of the lead screw into linear movement when performing off-center adjustment or height adjustment of the pickup. An object of the present invention is to provide a disk drive device in which the urging force for urging the disk hardly changes.

  By the way, when a disk drive device having a pickup feed mechanism as described above is mounted on a portable electronic device such as a movie, it is necessary to assume that a shock is applied to the housing due to dropping and a large inertial force acts on the pickup. is there.

  In other words, the member engaged with the groove of the lead screw is detached from the lead screw by this inertial force, and the pickup moves in the feed direction, and an excessive impact force due to the collision may be applied to the pickup and the pickup may be damaged. It is.

  Accordingly, another object of the present invention is to provide a disk drive device in which a pickup is not damaged by an impact at the time of dropping.

  In order to achieve the above object, a first disk drive device according to the present invention includes a spindle motor that is fixed to a base and rotationally drives the disk, and a diameter of the disk by two guide shafts fixed to the base. A pickup which is guided so as to be movable in a direction, and which records and / or reproduces information on the disc, a feed motor for driving the pickup along the guide shaft, and an axis line by the feed motor A lead screw having a spiral groove on the outer periphery, and a substantially linear shape that is positioned so as not to move in the feed direction with respect to the pickup and engages with the spiral groove of the lead screw. Having teeth, and converting the rotational movement of the lead screw into linear movement along the guide shaft of the pickup A disk drive device comprising: a conversion member; and a biasing member that is provided on the conversion member and biases the teeth of the conversion member against the lead screw, wherein the teeth are the conversion member. The urging member is arranged so as to be substantially parallel to the recording surface of the disc and is supported so as to be rotatable about an axis and slidable in the axial direction with respect to one guide shaft. And the teeth of the conversion member are urged against the lead screw in a direction substantially perpendicular to the recording surface of the disk.

  The second disk drive device according to the present invention is a guide fixed to a base and movably driven in a radial direction of the disk by a spindle motor that rotates the disk and two guide shafts fixed to the base. A pickup for recording and / or reproducing information to / from the disk, a feed motor for driving the pickup along the guide shaft, and a rotational drive around the axis by the feed motor, A lead screw having a spiral groove on the outer periphery, and a substantially linear tooth that is positioned so as not to move in the feed direction with respect to the pickup and engages with the spiral groove of the lead screw, A conversion member that converts the rotational movement of the lead screw into a linear movement along the guide shaft of the pickup; And a biasing member that biases teeth of the conversion member with respect to the lead screw, wherein the conversion member is substantially the same as the recording surface of the disk. It is arranged so as to be parallel to each other, and is engaged with the pickup so as to be rotatable around an axis with respect to one of the guide shafts so as not to come into contact therewith. The lead screw is sandwiched and the teeth of the conversion member are urged against the lead screw in a direction substantially perpendicular to the recording surface of the disk.

  A third disk drive device according to the present invention is a guide fixed to a base and movably driven in the radial direction of the disk by a spindle motor that rotates the disk and two guide shafts fixed to the base. A pickup for recording and / or reproducing information to / from the disk, a feed motor for driving the pickup along the guide shaft, and a rotational drive around the axis by the feed motor, A lead screw having a spiral groove on the outer periphery, and a substantially linear tooth that is positioned so as not to move in the feed direction with respect to the pickup and engages with the spiral groove of the lead screw, A conversion member that converts the rotational movement of the lead screw into a linear movement along the guide shaft of the pickup; And a biasing member that biases the teeth of the conversion member against the lead screw, wherein the conversion member has the lead screw between the teeth. A restricting portion is provided, and the restricting portion restricts movement of the lead screw so that the teeth are not detached from the lead screw due to an impact at the time of dropping.

  According to the first and second disk drive devices, when the off-center adjustment or height adjustment of the pickup is performed, the urging force of the urging member with respect to the lead screw hardly changes. It does not easily come off and the load on the feed motor does not increase.

  According to the third disk drive device, since the teeth of the nut member are not detached from the lead screw due to the impact at the time of dropping, the pickup does not move in the feed direction, and an excessive impact force due to the collision acts on the pickup. And the pickup will not be damaged.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view of a traverse mechanism of a disk drive device according to a first embodiment of the present invention, FIG. 2 is an enlarged perspective view of a pickup feed mechanism of the traverse mechanism of FIG. 1, and FIG. 3 is an enlarged view of a main part of FIG. 4 is an exploded perspective view of the pickup feed mechanism of FIG. 2, and FIG. 5 is a side view of the pickup feed mechanism of FIG.

  As shown in FIGS. 1 to 3, the traverse mechanism of the present embodiment includes a spindle motor 2 that is fixed to a base 1 and that rotates a disk (not shown).

  Reference numeral 3 denotes a pickup for recording and reproducing information with respect to the disk. The pickup 3 is guided by two guide shafts 4 and 5 fixed to the base 1 so as to be movable in the radial direction of the disk. Two bearings 3a and 3b are slidably engaged in the axial direction.

  The guide shafts 4 and 5 are attached to the base 1 so that off-center adjustment (adjustment in the direction A in FIG. 5) and height adjustment (adjustment in the direction B in FIG. 5) of the pickup 3 can be performed. .

  Reference numeral 6 denotes a feed motor for driving the pickup 3 along the guide shafts 4 and 5, and a lead screw 7 is connected to the rotation shaft of the feed motor 7. The lead screw 7 has a spiral groove 7 a on the outer periphery. is doing.

  A nut member 8 (conversion member) is attached to the guide shaft 4, and the nut member 8 has a plurality of substantially linear teeth 8 a (see FIG. 4) that engage with the spiral groove 7 a of the lead screw 7. The rotational movement of the lead screw 7 is converted into a linear movement along the guide shafts 4 and 5 of the pickup 3. When the feed motor 6 is driven, the pickup 3 slides along the guide shafts 4 and 5 to record and reproduce information on the disc.

  As shown in FIG. 4, the teeth 8a of the nut member 8 are formed on one surface of the plate-like portion 8b. The nut member 8 is disposed between the two bearings 3a and 3b of the pickup 3 so that the teeth 8a are substantially parallel to the recording surface of the disk, and is rotatable about the axis with respect to one guide shaft 4. And slidably supported in the axial direction.

  A substantially L-shaped leaf spring 9 (biasing member) is attached to the upper surface of the nut member 8 so as to sandwich the lead screw 7 between the teeth 8a (see FIG. 5). The leaf spring 9 has a first spring portion 9a on one end side, and the teeth 8a of the nut member 8 are substantially perpendicular to the recording surface of the disk with respect to the lead screw 7 by the first spring portion 9a. Is being energized.

  The plate spring 9 has a second spring 9b on the other end side, and the nut member 8 is urged toward the one bearing 3a by the second spring portion 9b to feed the pickup 3 to the pickup 3. Positioned so as not to move in the direction.

  According to such a configuration, when the off-center adjustment of the pickup 3 is performed, the nut member 8 moves together with the pickup 3 and the guide shaft 4 in the direction of arrow A in FIG. Moves in the direction of arrow C, which is substantially parallel to the direction of arrow A, so that the amount of bending of the first spring portion 9a of the leaf spring 9 hardly changes.

  Therefore, the urging force for urging the teeth 8a against the lead screw 7 is reduced, and the teeth 8a are easily detached from the lead screw 7, and conversely, the urging force is increased and the load of the feed motor 6 is increased. There is nothing.

  When the height of the pickup 3 is adjusted, the pickup 3 and the guide shaft 4 move together with the nut member 8 in the direction of arrow B. The nut member 8 is moved around the axis of the guide shaft 4 by the arrow D. Since it can rotate in the direction, the amount of bending of the first spring portion 9a of the leaf spring 9 does not change, and the urging force by the first spring portion 9a does not change. Therefore, as in the case of off-center adjustment, the urging force that urges the teeth 8a of the nut member 8 against the lead screw 7 is reduced, and the teeth 8a are easily detached from the lead screw 7, or conversely, the urging force is reduced. The load on the feed motor 6 does not increase.

  Moreover, in this embodiment, as shown in FIG.3 and FIG.5, the nut member 8 is provided with a pair of L-shaped restricting portions 8c that sandwich the lead screw 7 between the teeth 8a. The distance L between the restricting portion 8c and the lead screw 7 is smaller than the height of the tooth 8a, and the tooth 8a does not come off the lead screw 7 even when an impact at the time of dropping is applied.

  Therefore, the pickup 3 does not move in the feed direction and does not collide with the stoppers 10 to 13 (see FIG. 1) when dropped, and it is possible to prevent the pickup 3 from being damaged due to an excessive impact force due to the collision. . Further, it is possible to prevent the leaf spring 9 from being damaged due to an excessive impact force.

  Next, a second embodiment of the present invention will be described. FIG. 6 is an enlarged perspective view of the pickup feed mechanism of the traverse mechanism of the second embodiment, and FIGS. 7 and 8 are exploded perspective views of the pickup feed mechanism of FIG. In the following embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  In this embodiment, as shown in FIG. 7, the nut member 8 ′ has an annular convex portion 8 d that protrudes in the feed direction so as to be coaxial with the guide shaft 4 from one end side thereof, and has an inner diameter thereof. Is larger than the diameter of the guide shaft 4. As shown in FIG. 8, one bearing 3 a of the pickup 3 ′ is provided with an engagement recess 3 c having a circular cross section in which the protrusion 8 d engages rotatably around the axis. On the other hand, the nut member 8 'is in contact with the other bearing 3b side as in the first embodiment.

  As a result, as in the first embodiment, the nut member 8 ′ can rotate around the axis of the guide shaft 4, but in this embodiment, the bearing 3 a side of the nut member 8 ′ does not contact the guide shaft 4. Rotate. Similarly to the first embodiment, the nut member 8 ′ is biased by the leaf spring 9 (see FIG. 6) to the bearing 3a provided with the engagement recess 3c, and feed direction with respect to the pickup 3 ′. Is positioned.

  In the first embodiment, the nut member 8 is supported so as to be rotatable with respect to the guide shaft 4 and is also slidably supported on the guide shaft 4 in the feed direction, whereas in the second embodiment, the nut member 8 is supported. The bearing member 3 a side of the nut member 8 ′ is supported so as to be rotatable with respect to the pickup 3 ′ and does not slide with the guide shaft 4.

  When feed driving is performed, a moment force is generated when the driving force from the lead screw 7 is transmitted to the nut member 8 ′. In the first embodiment, the moment force causes a gap between the nut member 8 and the guide shaft 4. There is a possibility that a frictional force is generated and the slidability of the nut member 8 is deteriorated.

  In the present embodiment, the nut member 8 ′ is supported rotatably on the one bearing 3 a side with respect to the pickup 3 ′ and does not slide with the guide shaft 4. This reduces the deterioration of slidability when performing feed driving.

  Next, a third embodiment of the present invention will be described. 9 is an enlarged perspective view of the pickup feed mechanism of the third embodiment, and FIGS. 10 and 11 are exploded perspective views of the pickup feed mechanism of FIG.

  In the second embodiment, as shown in FIG. 6 to FIG. 8, an annular convex portion 8d coaxial with the guide shaft 4 is provided at one end of the nut member 8 ′, and one bearing 3a of the pickup 3 ′ An engagement recess 3c having a circular cross section is provided in which the protrusion 8d is rotatably engaged, and the nut member 8 'is biased by the bearing 3a by the second spring portion 9b of the leaf spring 9 so that positioning in the feed direction is performed. Has been done.

  In the present embodiment, in addition to the convex portion 8d and the engaging concave portion 3c of the second embodiment, as shown in FIG. 11, the other end of the nut member 8 '' is also an annular convex coaxial with the guide shaft 4. As shown in FIG. 10, the other bearing 3b of the pickup 3 ″ is provided with an engagement recess 3d into which the protrusion 8e is rotatably fitted. The convex portion 8 e is coaxial with the guide shaft 4 and has an inner diameter larger than the diameter of the guide shaft 4.

  In this way, both ends of the nut member 8 '' are rotatably supported by the pickup 3 '', and the moment force due to the feed drive is received by the pickup 3 '' at both ends of the nut member 8 ''. Since the moment member can prevent the nut member 8 ″ and the guide shaft 4 from coming into contact with each other, the sliding property of the nut member 8 ″ can be prevented more reliably.

  If the engaging recesses 3c and 3d are both circular in cross section, the nut member 8 '' cannot be assembled to the pickup 3 ''. However, the nut member 8 can be formed by making the engaging recess 3c U-shaped. The convex portion 8d on one end side of '' can be inserted into the engaging concave portion 3c from above.

  On the other hand, if the engagement recess 3c has a U-shaped cross section, the projection 8d may come off from the engagement recess 3c. However, the contact portion 8f of the nut member 8 ″ is formed by the spring portion 9b ′ of the leaf spring 9 ′. By pressing, the convex portion 8d is urged against the engaging concave portion 3c, and is prevented from coming off from the engaging concave portion 3c.

  Further, the spring portion 9b ′ of the leaf spring 9 ′ generates a pressing force in the feed direction by pressing the contact portion 8f of the nut member 8 ″ diagonally, and the nut member 8 ″ is picked up by the pickup 3 ′. Positioned in the feed direction with respect to '.

  The structure of the mechanism for urging the teeth 8a of the nut member 8 '' against the lead screw 7 by the leaf spring 9 'is the same as that of the second embodiment.

  As mentioned above, although one embodiment of the present invention has been described with specific examples, the present invention is not limited to the above-described embodiments.

  For example, in the above-described embodiment, the case where the pickup performs recording and reproduction of information with respect to the disc has been described. However, the pickup may perform either recording or reproduction of information.

  In addition, various modifications can be made to the above-described embodiments without departing from the gist of the present invention.

  The present invention is particularly effective when applied to a portable electronic device using a high recording density disc such as a DVD or a Blu-ray disc.

  Since this type of device has a high recording density of the disc, it is necessary to perform off-center adjustment and height adjustment of the pickup with high accuracy.

  In addition, since this type of device is particularly required to have low power consumption and small size and light weight, it is not preferable to use a large feed motor such as that used in stationary devices, and is small and has low torque. Although a feed motor is often used, a mechanism that can operate with high reliability even with such a motor is desired.

  In addition, in the case of a portable electronic device, it is necessary to assume use in a situation where the pickup moves upward, for example, since the user does not know the direction in which the user will use other than the normal usage method.

  Therefore, it is important for ensuring reliability during operation that the amount of fluctuation of the load of the feed motor is made as small as possible so that it can be used at a value close to the design value.

  According to the present invention, even if the position of the pickup is adjusted, the load of the feed motor hardly changes and does not deviate from the expected range at the time of design. Therefore, high reliability can be ensured.

  According to each of the above embodiments, when the off-center adjustment or height adjustment of the pickup is performed, the urging force of the urging member with respect to the lead screw hardly changes, and thus the teeth of the conversion member can be easily detached from the lead screw. The feed motor load will not increase.

  Further, according to each of the above embodiments, the teeth of the nut member do not come off the lead screw due to the impact at the time of dropping, so the pickup does not move in the feed direction, and the pickup has an excessive impact force due to the collision. It will not damage the pickup due to the action.

1 is a perspective view of a traverse mechanism of a disk drive device according to a first embodiment of the present invention. It is an expansion perspective view of the pickup feed mechanism of the traverse mechanism of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 3 is an exploded perspective view of the pickup feed mechanism of FIG. 2. FIG. 3 is a side view of the pickup feed mechanism of FIG. 2. It is an expansion perspective view of the pickup feed mechanism of the traverse mechanism of the 2nd Embodiment of this invention. FIG. 7 is an exploded perspective view of the pickup feed mechanism of FIG. 6. FIG. 7 is an exploded perspective view of the pickup feed mechanism of FIG. 6. It is an expansion perspective view of the pickup feed mechanism of the 3rd Embodiment of this invention. FIG. 10 is an exploded perspective view of the pickup feed mechanism of FIG. 9. FIG. 10 is an exploded perspective view of the pickup feed mechanism of FIG. 9. It is a perspective view of the pickup feed mechanism of the disk drive device of Conventional Example 1. It is side surface sectional drawing of the pickup feed mechanism of FIG. It is a top view of the pick-up feed mechanism of the disk drive device of the prior art example 2. It is the G section enlarged view of FIG. It is a H direction arrow line view of FIG. It is the II sectional view taken on the line of FIG.

Explanation of symbols

2 Spindle motor 3 Pickup 3a, 3b Bearing 3c, 3d Engaging recess 4 Guide shaft 5 Guide shaft 6 Feed motor 7 Lead screw 7a Spiral groove 8, 8 ', 8''Nut member (conversion member)
8c Restriction part 8d, 8e Convex part 9, 9 'Leaf spring (biasing member)

Claims (4)

A spindle motor that is fixed to the base and rotationally drives the disk, and two guide shafts that are fixed to the base are guided so as to be movable in the radial direction of the disk. A pickup that performs any one of the above, a feed motor for driving the pickup along the guide shaft, a lead screw that is rotationally driven around the axis by the feed motor and has a spiral groove on the outer periphery, and It is positioned so as not to move in the feed direction with respect to the pickup, has a substantially linear tooth that engages with a spiral groove of the lead screw, and rotates the lead screw along the guide shaft of the pickup A conversion member for converting into linear motion; and provided on the conversion member; A disk drive apparatus and a biasing member for biasing against the screw,
The conversion member is disposed so that the teeth are substantially parallel to the recording surface of the disk, and is supported to be rotatable about an axis with respect to one guide shaft and slidable in the axial direction. The biasing member is configured to sandwich the lead screw between teeth of the conversion member and bias the teeth of the conversion member to the lead screw in a direction substantially perpendicular to the recording surface of the disk. A disk drive device characterized by that. A spindle motor that is fixed to the base and rotationally drives the disk, and two guide shafts that are fixed to the base are guided so as to be movable in the radial direction of the disk. A pickup that performs any one of the above, a feed motor for driving the pickup along the guide shaft, a lead screw that is rotationally driven around the axis by the feed motor and has a spiral groove on the outer periphery, and It is positioned so as not to move in the feed direction with respect to the pickup, has a substantially linear tooth that engages with a spiral groove of the lead screw, and rotates the lead screw along the guide shaft of the pickup A conversion member for converting into linear motion; and provided on the conversion member; A disk drive apparatus and a biasing member for biasing against the screw,
The conversion member is disposed so that the teeth are substantially parallel to the recording surface of the disc, and is engaged with the pickup so as to be rotatable about an axis and not in contact with one guide shaft, The biasing member is configured to sandwich the lead screw between the teeth of the conversion member and bias the teeth of the conversion member to the lead screw in a direction substantially perpendicular to the recording surface of the disk. A disk drive device characterized by that.   The pickup includes two bearings slidably engaged with the one guide shaft in the axial direction, and the conversion member is disposed between the two bearings and has both ends in the feed direction. The convex part which protruded in the feed direction was provided in at least one of the parts, and the engagement recessed part which the said convex part engages rotatably is provided in at least one of these two bearings. 3. The disk drive device according to 2. A spindle motor that is fixed to the base and rotationally drives the disk, and two guide shafts that are fixed to the base are guided so as to be movable in the radial direction of the disk. A pickup that performs any one of the above, a feed motor for driving the pickup along the guide shaft, a lead screw that is rotationally driven around the axis by the feed motor and has a spiral groove on the outer periphery, and It is positioned so as not to move in the feed direction with respect to the pickup, has a substantially linear tooth that engages with a spiral groove of the lead screw, and rotates the lead screw along the guide shaft of the pickup A conversion member for converting into linear motion; and provided on the conversion member; A disk drive apparatus and a biasing member for biasing against the screw,
The conversion member includes a restricting portion that sandwiches the lead screw with the teeth, and the restricting portion restricts the movement of the lead screw so that the teeth are not detached from the lead screw due to an impact at the time of dropping. A disk drive device characterized by that.

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