WO2005096287A1 - ピックアップ用アクチュエータ、ピックアップ装置、記録媒体駆動装置、およびピックアップ用アクチュエータの製造方法 - Google Patents
ピックアップ用アクチュエータ、ピックアップ装置、記録媒体駆動装置、およびピックアップ用アクチュエータの製造方法 Download PDFInfo
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- WO2005096287A1 WO2005096287A1 PCT/JP2005/006153 JP2005006153W WO2005096287A1 WO 2005096287 A1 WO2005096287 A1 WO 2005096287A1 JP 2005006153 W JP2005006153 W JP 2005006153W WO 2005096287 A1 WO2005096287 A1 WO 2005096287A1
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- WIPO (PCT)
- Prior art keywords
- center
- pickup
- actuator
- linear elastic
- elastic members
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0932—Details of sprung supports
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/0857—Arrangements for mechanically moving the whole head
- G11B7/08582—Sled-type positioners
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0933—Details of stationary parts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0935—Details of the moving parts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
Definitions
- the present invention relates to a pickup actuator, a pickup device, a recording medium driving device, and a method for manufacturing a pickup actuator.
- a pickup actuator has been used as a mechanism for recording and Z or reproducing an optical recording medium.
- various types of pickup actuators There are various types of pickup actuators.
- research on pickup actuators capable of recording and Z or reproducing an optical recording medium at a higher speed has been advanced.
- Examples of such a pickup actuator include a lens holder for supporting an objective lens and a magnet, a drive coil for driving the lens holder, a base, and both ends between the lens holder and the base.
- a pickup actuator includes four connected linear elastic members and supports a lens holder so as to swing in a focus direction and a tracking direction (for example, Patent Document 1).
- Such a pickup actuator has attracted attention because it is particularly effective in reducing the weight and increasing the bandwidth.
- Such a pickup actuator has a linear elastic member of six or more (Patent Document 2).
- the lens holder rolls with respect to the base with the center of the virtual circle circumscribing these ends as the center of rotation.
- the center of this rectangle substantially coincides with the center of mass of the lens holder and the drive center of the lens holder, and furthermore, the drive center of the lens holder is determined by the translational force of the plurality of linear elastic members. Coincide with the center.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-229555 (FIGS. 15, 16)
- Patent Document 2 JP-A-8-273179 (paragraph number "0031")
- the spring force (elastic force) may be different between the linear elastic members, and the center of the translational force of the linear elastic member is shifted from the central force of the rectangle.
- the center of gravity of the mass and the center of the driving force are centered on this point. Then, these do not coincide with the rolling center, and unnecessary rotation moment occurs in the lens holder, and unnecessary resonance occurs.
- the rolling frequency when the lens holder rolls increases, and the damping property deteriorates. If damping deteriorates, it will continue to vibrate.
- the present invention provides a pickup actuator, a pickup device, a recording medium driving device, and a pickup that can suppress an increase in a rolling frequency and prevent aggravation of damping even when a movable portion rolls with respect to a fixed portion.
- One object is to provide a method of manufacturing a factory actuator.
- the pickup actuator of the present invention holds a fixed portion, an objective lens, and has a drive unit force in a focusing direction along an optical axis of the objective lens and in a tracking direction substantially orthogonal to the focusing direction.
- a movable part movable by a driving force; and five or more linear elastic members each having an end connected to the movable part and the fixed part.
- the end of the member is located on a virtual circle formed in a plane projected on a plane including both the focus direction and the tracking direction, and with respect to the rolling center defined as the center of this virtual circle, Of moving parts At least one of a center of weight, a center of a driving force of the movable portion, and a center of a translation force of the linear elastic member is made to coincide with each other.
- the pickup actuator of the present invention includes a fixing unit, a driving unit which holds an objective lens, and has a driving force in a focusing direction along an optical axis of the objective lens and in a tracking direction substantially orthogonal to the focusing direction.
- a movable portion movable by the driving force of the above, and four linear elastic members each having an end connected to the movable portion and the fixed portion, wherein the four linear elastic members are provided. Are located on a virtual circle formed in a plane projected on a plane including both the focus direction and the tracking direction, and the line connecting the ends is substantially trapezoidal.
- a center of weight of the movable portion characterized in that.
- a pickup device of the present invention includes the above-described pickup actuator of the present invention, and an actuator driving unit that drives the pickup actuator.
- a recording medium driving device of the present invention includes the above-described pickup device of the present invention.
- the method of manufacturing a pickup actuator according to the present invention is a method for holding a fixed portion, an objective lens, and being movable in a focus direction along an optical axis of the objective lens and in a tracking direction substantially orthogonal to the focus direction.
- a method for manufacturing a pickup actuator comprising: a movable part having a predetermined shape; and at least five linear elastic members each having an end connected to the movable part and the fixed part.
- the ends of the plurality of linear elastic members are positioned on a virtual circle formed on a plane projected on a plane including both the focus direction and the tracking direction, and are defined as the centers of the virtual circles.
- the method of manufacturing a pickup actuator according to the present invention may further comprise: And a movable part which is movable in a tracking direction substantially orthogonal to a focus direction and a force direction along the optical axis of the objective lens, and ends at the movable part and the fixed part, respectively.
- a method for manufacturing a pickup actuator comprising: four linear elastic members having connected portions, wherein the ends of the four linear elastic members are respectively adjusted in both a focus direction and a tracking direction.
- FIG. 1 is a perspective view showing an entire pickup device working on a first embodiment of the present invention.
- FIG. 2 is a plan view showing the entire pickup device of the first embodiment.
- FIG. 3A is a schematic diagram of a suspension mounting structure according to the first embodiment as viewed in a tracking direction.
- FIG. 3B is a schematic view of the suspension mounting structure of the first embodiment as viewed from a focus direction.
- FIG. 4 is a schematic view of the suspension mounting structure in the first embodiment as viewed toward a lens holder force suspension base.
- FIG. 5 is a perspective view showing an entire pickup device according to a second embodiment of the present invention.
- FIG. 6 is a plan view showing the entire pickup device of the second embodiment.
- FIG. 7A is a schematic diagram of a suspension mounting structure according to the second embodiment as viewed in a tracking direction force.
- FIG. 7B is a schematic diagram of the mounting structure of the suspension according to the second embodiment as viewed from a focus direction.
- FIG. 8 is a schematic view of the suspension mounting structure of the second embodiment as viewed from a suspension base toward a lens holder.
- FIG. 9 is a schematic diagram illustrating a means for setting a center Os of a translational force of a suspension in the second embodiment.
- FIG. 10 is a schematic diagram showing a modification of the present invention and corresponding to FIGS. 3B and 7B.
- a pickup device 1 is a device for recording and Z or reproducing an optical recording medium, for example, an optical disk such as a CD, DVD, or Blu-ray. Therefore, the pickup device 1 is incorporated in a drive device for recording and Z or reproducing these optical recording media, for example.
- the pickup device 1 includes a pickup body 200, an actuator base 300 fixed to the pickup body 200, and a pickup actuator 400 fixed to the actuator base 300.
- the pickup actuator 400 includes a suspension base 500 as a fixed part, a lens holder 600 as a movable part, and six suspensions 550A to 550F as linear elastic members connecting the suspension base 500 and the lens holder 600. Is provided.
- the actuator base 300 includes upright portions 310a and 310b that are parallel to each other. Projections 311 protruding toward the pickup body 200 are formed on the standing portions 310a and 310b.
- Actuator base 300 is positioned by engaging protrusion 311 with M-shaped holding portion 210 formed on pickup body 200.
- the actuator base 300 has one end inserted into a spring-supported column 201 fixed to the pickup body 200, and the other end fixed with a fixing screw 202.
- the pickup actuator 400 engages the V-shaped groove 509 formed in the suspension base 500 with the M-shaped protruding plate 301 formed in the actuator base 300, so that the pickup actuator 400 is located between the standing portions 310a and 310b. Is positioned.
- the pickup actuator 400 is fixed to the actuator base 300 by screwing the suspension base 500 to the actuator base 300.
- stopper members 320 are provided in the standing portions 310a and 310b.
- the stopper member 320 is a linear member entirely bent in a substantially U-shape.
- a stopper (not shown) is provided at the tip of the stopper member 320 and protrudes toward the inside of the upright portions 310a and 310b, that is, toward the lens holder 600.
- the stopper member 320 is attached by inserting the stopping portion into an insertion hole (not shown) provided in the standing portions 310a and 310b.
- the stopper member 320 limits the stroke (movable range) of the lens holder 600 in the focus direction F and the tracking direction T.
- a laser light source (not shown) is attached to the end of the actuator base 300.
- the laser light emitted from the laser light source passes below an objective lens 620 described later through an optical path formed by an optical system disposed in the actuator base 300.
- a raising mirror (not shown) is arranged below the objective lens 620, and the laser light is diverted upward by the raising mirror and passes through the objective lens 620 from below to above.
- An optical disk (not shown) is disposed above the objective lens 620, and the objective lens 620 focuses the laser light on the information recording surface of the optical disk.
- the suspensions 550A to 550F connect the suspension base 500 and the lens holder 600.
- a material for the suspensions 550A to 550F it is preferable to use a material having high strength to withstand strong bending stress as a spring material and having excellent fatigue resistance to repeated action, such as beryllium copper.
- the material is not limited to beryllium copper, and another material such as a phosphor bronze alloy having high strength and fatigue resistance may be used as a substitute material.
- plate portions 560A to 560F to be inserted into the suspension base 500 and the lens holder 600 are provided.
- the suspension base 500 is formed by insert molding in which a flat plate portion 560A to 560F at the tip of the suspension 550A to 550F is set in a mold and a synthetic resin is injected.
- a suspension passage 520 is formed.
- Suspension passages 520 are provided with suspensions 550A to 550F, and flat portions 560A to 560F provided at the ends of suspensions 550A to 550F are also attached to the suspension passages 520 so that the opposing surface forces of the suspension passages penetrate to the rear side. I have.
- a V-shaped groove 509 is formed on the back surface of the suspension base 500.
- the V-shaped groove 509 is engaged with the M-shaped protruding plate 301 formed on the actuator base 300 to position the suspension base 500 on the actuator base 300.
- the upper surface of the suspension base 500 is provided with two mounting holes 530 penetrating the lower surface.
- the pickup actuator 400 is fixed to the actuator base 300 by inserting a screw with a spring and a fixing screw (not shown) into the mounting hole 530.
- the lens holder 600 is swingably connected to the suspension base 500 by six suspensions 550A to 550F.
- the lens holder 600 is a substantially rectangular member having a hollow structure formed of a synthetic resin. Generated simultaneously with Suspension Base 500. At both ends of the lens holder 600 in the tracking direction, a pair of support arms 630 are provided, and the ends of the suspensions 550A to 550F are fixed to the support arms 630.
- Coil substrates 610A and 610B are respectively mounted on both side surfaces of the lens holder 600, and an objective lens 620 is mounted substantially at the center of the upper surface of the lens holder 600. A pair of lens substrates 600 mounted on the lens holder 600 is mounted.
- Magnets 340A and 340B are fixed to the actuator base 300 so as to face the coil substrates 610A and 610B, respectively.
- the actuator driver of the present embodiment is constituted by the coil substrates 610A and 610B and the magnets 340A and 340B.
- a pair of magnets 340A and 340B are fixed at positions facing each other, and a magnetic field is formed in a space between the magnets 340A and 340B in accordance with the magnetization pattern of each magnet.
- the lens holder 600 having the coil substrates 610A and 610B attached to the side faces is disposed in a magnetic field formed by a pair of magnets 340A and 340B. Therefore, when a drive current having a frequency in a predetermined servo band (for example, 0 to 5 KHz) is applied to the focus coil and the tracking coil formed on the coil substrates 61 OA and 610B, the current is generated by the current in the coil and the magnetic field. Due to the force, the lens holder 600 moves together with the objective lens 620 in the focus direction F and the tracking direction T.
- a predetermined servo band for example, 0 to 5 KHz
- 3A, 3B, and 4 schematically show a mounting structure of the suspensions 550A to 550F.
- the ends (connection portions) of the six suspensions 550A to 550F on the suspension base 500 side and the lens holder 600 side are formed in a plane projected on a plane including both the focus direction and the tracking direction.
- the center O of the virtual circle X is defined as the rolling center O of the lens holder 600.
- the plane on which the virtual circle X is formed is parallel to a plane orthogonal to the longitudinal direction of the six suspensions 550A to 550F.
- Rolling center O is within a plane perpendicular to the longitudinal direction of suspensions 550A to 550F.
- these suspensions 550A to 550F are centers for rotating without causing distortion in the axial direction.
- the line segment connecting the ends of the adjacent suspensions 550A to 550F is a hexagonal shape that is symmetrical with respect to the rolling center O! /.
- the line connecting the ends of the suspension 550A and the suspension 550B is parallel to the tracking direction, and its length is LA.
- the length of the line segment down from the rolling center to this line segment is A.
- the line connecting the ends of the suspension 550D and the suspension 550E is parallel to the tracking direction, and has a length dimension force LB.
- the length of the line segment down from the center of rolling to this line segment is B.
- the line connecting the ends of the suspension 550F and the suspension 550C is parallel to the tracking direction, and is the length dimensional force LC.
- the length of the line segment extending from the center of rolling to this line segment is C.
- suspensions 550A to 550C and 550F are arranged on the recording medium side (upper in FIG. 4) from the rolling center O, and the suspensions 550D and 550E are arranged on the anti-recording medium side (lower in FIG. 4) from the rolling center O.
- the following means is used to set the center Os of the translation force of the suspensions 550A to 550F.
- the center Os of the translational force of the suspensions 550A to 550F is a point where the spring force does not produce a balanced rotation when the lens holder 600 is translated.
- the elastic modulus (spring rigidity) of the suspensions 550A and 550B adjacent in the tracking direction is KA
- the elastic modulus (spring rigidity) of the suspensions 550D and 550E is KB
- the elastic modulus (spring rigidity) of the suspension 55 OF and 550C is KC
- the specific shape of the cross section is not limited, and may be, for example, a circle, an ellipse, a triangle, a rectangle, or a pentagon or more polygon.
- the center of mass of the lens holder 600 is uniquely set by the shape of the lens holder 600.
- the drive center of the lens holder 600 is uniquely set by the position of the coil and the position of the magnet. Normally, the center of mass and the center of drive of the lens holder 600 are set to coincide with the center of translational force Os of the suspensions 550A to 550F.
- the rolling center O and the center of the translational force can be set by arbitrarily setting the rolling center O or the center of the translational force Os of the suspensions 550A to 550F. Os, the center of mass and the center of drive of the lens holder 600 are matched.
- suspensions 550A to 550F are arranged at predetermined positions of a mold (not shown) having a cavity for molding the suspension base 500 and the lens holder 600. .
- the ends of the suspensions 550A to 550F are positioned on virtual circles formed in planes including both the focus direction and the tracking direction, and the center of the rolling defined as the center of the virtual circle is
- the center of weight of the lens holder 600, the center of the driving force of the lens holder 600, and the center Os of the translation force of the suspensions 550A to 550F are made to coincide.
- the pickup actuator 400 of the present embodiment includes a suspension base 500, a lens holder 600 that holds the objective lens 620, and is movable in a focusing direction and a tracking direction along the optical axis of the objective lens 620, respectively. Equipped with six suspensions 550A to 550F, the ends of which are connected to the suspension base 500 and the lens holder 600, respectively. The ends of the six suspensions 550A to 550F can be used for both the focus direction and the tracking direction, respectively.
- the elastic modulus (spring rigidity) KA, KB, KC of each suspension 550A to 550F and the line connecting the ends of the suspensions adjacent to each other in the tracking direction are lowered from the rolling center O.
- the center Os of the translational force of the suspensions 550A to 550F can be set.
- the center of mass can be rationally set to match the rolling center O by adjusting the mounting position of the drive coil and magnet so that the center of mass can be set rationally by the lens holder shape and unnecessary. Resonance can be effectively prevented.
- the three suspensions 550A to 550F are arranged symmetrically about the rolling center O to form three springs 550A to 550F.
- the force can be made equal left and right.
- the pickup device 1 of the present embodiment includes the pickup actuator 400 having the above-described configuration, and the coil substrates 610A and 610B and the magnets 340A and 340B for driving the pickup actuator 400.
- Pick that can produce the effect of Up device 1 can be provided.
- the recording medium driving device of the present embodiment includes the pickup device 1 having the above-described configuration
- the pickup actuator 400 in manufacturing the pickup actuator 400, six suspensions 550 A to 550 F are installed in a mold at predetermined positions, and molten resin is injected from an injection port of the mold to perform insert molding.
- the suspension base 500 and the lens holder 600 can be formed at the same time as these members can be connected by the suspensions 550A to 550F, so that the pickup actuator 400 can be manufactured in a short time.
- the present embodiment has the same basic structure as the first embodiment. Therefore, in the following description, the same components will be denoted by the same reference numerals, overlapping description will be omitted, and portions different from the first embodiment will be described.
- the pickup device 1 of the present embodiment has a structure basically similar to that of the above-described first embodiment.
- the linear elastic members are the six suspensions 550A to 55OF, whereas in the present embodiment, four suspensions 550A to 550D are used as the linear elastic members. .
- the pickup actuator 400 includes a suspension base 500 as a fixed part, a lens holder 600 as a movable part, and six suspension bases 500 and six linear elastic members connecting the lens holder 600 to each other. It has suspensions 550A to 550F.
- FIG. 7A, 7B, and 8 schematically show a mounting structure of the suspensions 550A to 550D.
- the ends (connection portions) of the four suspensions 550A to 550D on the suspension base 500 side and the lens holder 600 side are formed in a plane projected on a plane including both the focus direction and the tracking direction.
- the center O of the virtual circle X is defined as the rolling center of the lens holder 600.
- the plane on which the virtual circle X is formed is parallel to a plane orthogonal to the longitudinal direction of the four suspensions 550A to 550D.
- the line connecting the ends of the suspensions 550A to 550D has a substantially trapezoidal shape as a whole.
- the substantially trapezoidal shape includes, of course, a shape in which the upper and lower bases of the trapezoidal shape are strictly parallel, but the shape in which the upper and lower bottoms are not strictly parallel. Is also included.
- the line connecting the suspensions 550C and 550D forms the trapezoidal lower base, and the dimension of the line drawn from the center O of the mouth ring to this lower base is hi.
- the line segment connecting the suspensions 550A and 550B forms the trapezoidal upper base, and the dimension of the line segment lowered from the mouth ring center C to the upper base is h2.
- the line connecting the ends of the suspensions 550A to 550D has a trapezoidal shape, and is hl ⁇ h2.
- the ratio between the line connecting the suspensions 550A and 550B and the line connecting the suspensions 55OC and 550D the dimensions of hi and h2 are set, thereby increasing the height of the rolling center O. Can be set.
- the following means are used to set the center Os of the translational force of the suspensions 550A to 550D.
- the cross sections of the suspensions 550A to 550D are rectangular, the cross-sectional widths of the trapezoidal suspensions 550A and 550B are tl, and the suspension width of the trapezoidal bottom is 550C, The section width of 550D is t2 ( ⁇ tl). The thickness dimensions of these suspensions 550A to 550D are the same.
- the center Os of the translational force of the suspensions 550A to 550D is set by setting the values of t2 and tl.
- the center Os of the translational force of the suspensions 550A to 550D means a point at which the spring force does not cause a balanced rotation when the lens holder 600 is translated.
- the sectional thickness may be changed in place of the sectional width.
- the specific shape of the cross-section is not limited, and may be a circle, an ellipse, a triangle, a polygon such as a pentagon or more.
- the center Os of the translation force of the suspensions 550A to 550D can be set.
- the center of mass of the lens holder 600 is uniquely set according to the shape of the lens holder 600.
- the driving center of the lens holder 600 is uniquely set by the position of the coil and the position of the magnet. Normally, the center of mass and the center of drive of the lens holder 600 are set to coincide with the center of translational force Os of the suspensions 550A to 550D!
- the force for arbitrarily setting the mouth ring center O by setting the dimensions of hi and h2, or the center Os for the translational force of the suspensions 550A to 550D can be set arbitrarily.
- suspensions 550A to 550D are arranged at predetermined positions of a mold (not shown) having a cavity for molding the suspension base 500 and the lens holder 600. .
- the ends of the suspensions 550A to 550D are located on imaginary circles formed in planes including both the focusing direction and the tracking direction, and the line connecting the ends is substantially trapezoidal.
- the center of rolling defined as the center of this virtual circle, the center of weight of the lens holder 600, the center of driving force of the lens holder 600, and the suspension pen Chillon 550A to 550D center of translational force Os.
- pickup actuator 400 is insert-molded with suspensions 550A to 550D connected between suspension base 500 and lens holder 600.
- the pickup actuator 400 of the present embodiment includes a suspension base 500, a lens holder 600 that holds the objective lens 620, and is movable in a focusing direction and a tracking direction along the optical axis of the objective lens 620, respectively.
- the suspension base 500 and the lens holder 600 are provided with four suspensions 550A to 550D, the ends of which are connected to the suspension base 500 and the lens holder 600, respectively.
- a line segment located on an imaginary circle X formed in a plane projected on the containing plane and connecting the ends thereof has a substantially trapezoidal shape, and a rolling center O defined as the center of the imaginary circle X; Center of weight of lens holder 600, center of driving force of lens holder 600, and center of translation force Os of suspensions 550A to 550D Match. Therefore, since the rolling center O and the above-mentioned three centers coincide with each other, no rotational moment is generated in the lens holder 600, so that generation of unnecessary resonance can be prevented. In addition, it is possible to suppress an increase in the rolling frequency when the lens holder 600 rolls, and it is possible to prevent aggravation of attenuation.
- the line connecting the ends of the four suspensions 550A to 550D has a substantially trapezoidal shape
- the volume ratio is changed by changing the length ratio between the upper and lower bases of the trapezoidal shape.
- the position of the rolling center O can be easily changed.
- two suspensions 550A and 550B forming the upper base of the trapezoidal shape and two suspensions forming the lower base are set. If materials having different elastic coefficients are used for the suspensions 550C and 550D, the cross-sectional area (thickness) of all the suspensions 550A to 550D can be made the same as the conventional one. Therefore, the connection structure between the suspensions 550A to 550D, the suspension base 500, and the lens holder 600 can be the same as the conventional structure, and the manufacture of the pickup actuator 400 can be easily performed.
- the pickup device 1 of the present embodiment includes the pickup actuator 400 having the above-described configuration, and the coil substrates 610A and 610B and the magnets 340A and 340B for driving the pickup actuator 400. It is possible to provide the pickup device 1 capable of achieving the effect of (1).
- the recording medium driving device of the present embodiment includes the pickup device 1 having the above-described configuration, it is possible to provide a recording medium driving device capable of achieving the above-described effects.
- the pickup actuator 400 when manufacturing the pickup actuator 400, insert molding is performed by installing four suspensions 550A to 550D in a mold at predetermined positions and injecting molten resin from an injection port of the mold.
- the suspension base 500 and the lens holder 600 can be formed at the same time as these members can be connected by the suspensions 550A to 550D, so that the pickup actuator 400 can be manufactured in a short time.
- the recording medium drive of the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the spirit of the present invention.
- the insert molding method was used in manufacturing the pickup actuator 400.
- the suspension base 500 and the lens holder 600 are separately or simultaneously molded by the injection molding method, and then the suspension base 500 is formed.
- the lens holder 600 and the Poko suspension 550A to 550F may be bonded, soldered, screwed, or the like.
- the number of suspensions 550A to 550F is not limited to six, but may be five, seven, eight or more.
- the force indicating six parallel suspensions is not necessarily parallel.
- the distance between the movable end and the support end of the fixed end, which is not necessarily parallel, is different. Line) Suspension is good!
- the rolling center O defined as the center of the virtual circle X
- the center of weight of the lens holder 600, the center of the driving force of the lens holder 600, and the center of the translational force Os of the suspensions 550A to 550F coincide with the center Os of the rolling. At least one of the weight center of 600, the center of driving force of the lens holder 600, and the center of translation force Os of the suspensions 550A to 550F!
- the center of weight of the lens holder 600 and the center O of rolling may be matched.
- the center of the driving force of the lens holder 600 and the center Os of the translational force of the suspensions 550A to 550F do not necessarily need to coincide with the rolling center O.
- any one of the center of weight of the lens holder 600, the center of the driving force of the lens holder 600, and the center Os of the translation force of the suspensions 550A to 550F coincides with the rolling center O. Needless to say, this may be done.
- by making them all coincide with each other it is possible to effectively suppress the generation of a rotational moment in the lens holder 600, so that the occurrence of unnecessary resonance can be suppressed.
- connection part of the suspensions 550A to 550F is a force located on a plane including the focus direction and the tracking direction.
- the connection part of the suspensions 550A to 550F is offset, This is included even when not on the plane.
- the line connecting the connection portions of the suspensions 550A to 550F in the lens holder 12 is not parallel to the plane of a coil substrate (not shown) attached to the lens holder 600.
- the line connecting the connecting portions of the suspension bases 550A to 550F in the suspension base 500 is not parallel to the plane of the coil substrate.
- FIG. 5 only the suspensions 550A and 550B are shown, and illustration of the other suspensions 550C to 550F is omitted.
- the present invention can be used for a pickup actuator, a pickup device, a recording medium driving device, and a method for manufacturing a pickup actuator, and can be used for a device for recording and reproducing an optical recording medium.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006511761A JPWO2005096287A1 (ja) | 2004-03-30 | 2005-03-30 | ピックアップ用アクチュエータ、ピックアップ装置、記録媒体駆動装置、およびピックアップ用アクチュエータの製造方法 |
US10/594,948 US7911888B2 (en) | 2004-03-30 | 2005-03-30 | Actuator for pickup, pickup device, recording medium drive device, and method of manufacturing actuator for pickup |
US12/926,285 US8169864B2 (en) | 2004-03-30 | 2010-11-08 | Actuator for pickup, pickup device, recording medium drive device, and method of manufacturing actuator for pickup |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004099392 | 2004-03-30 | ||
JP2004-099392 | 2004-03-30 | ||
JP2004099314 | 2004-03-30 | ||
JP2004-099314 | 2004-03-30 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/594,948 A-371-Of-International US7911888B2 (en) | 2004-03-30 | 2005-03-30 | Actuator for pickup, pickup device, recording medium drive device, and method of manufacturing actuator for pickup |
US12/926,285 Division US8169864B2 (en) | 2004-03-30 | 2010-11-08 | Actuator for pickup, pickup device, recording medium drive device, and method of manufacturing actuator for pickup |
Publications (1)
Publication Number | Publication Date |
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WO2005096287A1 true WO2005096287A1 (ja) | 2005-10-13 |
Family
ID=35064030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/006153 WO2005096287A1 (ja) | 2004-03-30 | 2005-03-30 | ピックアップ用アクチュエータ、ピックアップ装置、記録媒体駆動装置、およびピックアップ用アクチュエータの製造方法 |
Country Status (3)
Country | Link |
---|---|
US (2) | US7911888B2 (ja) |
JP (1) | JPWO2005096287A1 (ja) |
WO (1) | WO2005096287A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007226933A (ja) * | 2006-01-25 | 2007-09-06 | Matsushita Electric Ind Co Ltd | 対物レンズ駆動装置、対物レンズ駆動装置の製造方法、光ピックアップ装置、及び光ディスク装置 |
US20140091152A1 (en) * | 2012-09-28 | 2014-04-03 | Invensys Appliance Controls South America | Temperature sensor using aluminum capillary |
Citations (11)
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JPH02121126A (ja) * | 1988-10-28 | 1990-05-09 | Olympus Optical Co Ltd | 光学系支持装置 |
JPH02289927A (ja) * | 1989-04-28 | 1990-11-29 | Victor Co Of Japan Ltd | 対物レンズ保持装置 |
JPH032426A (ja) * | 1989-05-30 | 1991-01-08 | Mitsui Constr Co Ltd | 鋼管杭のライニング方法 |
JPH06349091A (ja) * | 1993-06-07 | 1994-12-22 | Matsushita Electric Ind Co Ltd | 光学ヘッド |
JPH09259453A (ja) * | 1996-03-19 | 1997-10-03 | Victor Co Of Japan Ltd | 光学的ピックアップ装置 |
JP2000242942A (ja) * | 1999-02-18 | 2000-09-08 | Akai Electric Co Ltd | 光ヘッドアクチュエータの支持構造 |
JP2001093177A (ja) * | 1999-09-22 | 2001-04-06 | Hitachi Media Electoronics Co Ltd | 対物レンズ駆動装置 |
JP2001229555A (ja) * | 2000-02-09 | 2001-08-24 | Pioneer Electronic Corp | レンズ駆動装置、レンズ駆動装置用のサスペンションユニット及びレンズ駆動装置の製造方法 |
JP2001344784A (ja) * | 2000-03-29 | 2001-12-14 | Matsushita Electric Ind Co Ltd | レンズ駆動装置、当該装置を用いた光ピックアップおよびレンズ駆動装置の製造方法 |
JP2003346366A (ja) * | 2002-05-23 | 2003-12-05 | Mitsubishi Electric Corp | 光学手段駆動装置 |
JP2004047060A (ja) * | 2002-07-09 | 2004-02-12 | Samsung Electronics Co Ltd | 光ピックアップの対物レンズ駆動装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0750023A (ja) | 1993-08-04 | 1995-02-21 | Matsushita Electric Ind Co Ltd | 対物レンズ駆動装置 |
JPH08273179A (ja) | 1996-04-27 | 1996-10-18 | Pioneer Electron Corp | 光学式ピックアップ装置のアクチュエータ |
-
2005
- 2005-03-30 US US10/594,948 patent/US7911888B2/en not_active Expired - Fee Related
- 2005-03-30 JP JP2006511761A patent/JPWO2005096287A1/ja active Pending
- 2005-03-30 WO PCT/JP2005/006153 patent/WO2005096287A1/ja active Application Filing
-
2010
- 2010-11-08 US US12/926,285 patent/US8169864B2/en not_active Expired - Fee Related
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02121126A (ja) * | 1988-10-28 | 1990-05-09 | Olympus Optical Co Ltd | 光学系支持装置 |
JPH02289927A (ja) * | 1989-04-28 | 1990-11-29 | Victor Co Of Japan Ltd | 対物レンズ保持装置 |
JPH032426A (ja) * | 1989-05-30 | 1991-01-08 | Mitsui Constr Co Ltd | 鋼管杭のライニング方法 |
JPH06349091A (ja) * | 1993-06-07 | 1994-12-22 | Matsushita Electric Ind Co Ltd | 光学ヘッド |
JPH09259453A (ja) * | 1996-03-19 | 1997-10-03 | Victor Co Of Japan Ltd | 光学的ピックアップ装置 |
JP2000242942A (ja) * | 1999-02-18 | 2000-09-08 | Akai Electric Co Ltd | 光ヘッドアクチュエータの支持構造 |
JP2001093177A (ja) * | 1999-09-22 | 2001-04-06 | Hitachi Media Electoronics Co Ltd | 対物レンズ駆動装置 |
JP2001229555A (ja) * | 2000-02-09 | 2001-08-24 | Pioneer Electronic Corp | レンズ駆動装置、レンズ駆動装置用のサスペンションユニット及びレンズ駆動装置の製造方法 |
JP2001344784A (ja) * | 2000-03-29 | 2001-12-14 | Matsushita Electric Ind Co Ltd | レンズ駆動装置、当該装置を用いた光ピックアップおよびレンズ駆動装置の製造方法 |
JP2003346366A (ja) * | 2002-05-23 | 2003-12-05 | Mitsubishi Electric Corp | 光学手段駆動装置 |
JP2004047060A (ja) * | 2002-07-09 | 2004-02-12 | Samsung Electronics Co Ltd | 光ピックアップの対物レンズ駆動装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005096287A1 (ja) | 2008-07-31 |
US20080037384A1 (en) | 2008-02-14 |
US8169864B2 (en) | 2012-05-01 |
US7911888B2 (en) | 2011-03-22 |
US20110103203A1 (en) | 2011-05-05 |
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