JP2008103002A - Actuator device and optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce thermal damaging of a lens holding part when a print coil and a linear elastic member are electrically interconnected in an actuator device having the linear elastic member insert-formed in the lens housing part made of a resin. <P>SOLUTION: In the actuator device 3 having a linear elastic member 11 insert-formed in a lens holder 9, when a print coil 7 and attached to the longitudinal side face of the lens holder 9 and the linear elastic member 11 are electrically interconnected, a columnar part 9f is disposed in the box part 9h of the lens holder 9, and the connection part 11c of the linear elastic member 11 with the print coil 7 is disposed in the surface of the columnar part 9f. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical pickup device used in an optical disk reproducing device and the like, and an actuator device used in the optical pickup device to drive an objective lens in a focus and tracking direction.

  An optical pickup device used for an optical disk reproducing device or the like is used to read information recorded on an optical disk such as a CD (Compact Disk) or a DVD (Digital Versatile Disk). Focusing control for controlling the distance between the objective lens and the objective lens, and tracking control for controlling the objective lens to follow the eccentricity of the track of the optical disk.

  For example, as shown in Patent Document 1, the optical pickup device has a built-in objective lens, a lens holder in which a printed coil is fixed on both side surfaces, and a linear elastic member connected to the lens holder so that the lens holder can be moved. It comprises an actuator device comprising a supported actuator base, a yoke, a light source, a collimator lens, a beam splitter, a pickup body, and the like.

The lens holder and the actuator base of the actuator device are molded from resin, and when the lens holder and the actuator base of the actuator device are molded, the linear elastic member is also insert-molded integrally. The linear elastic member is electrically connected to the print coil. By supplying a focus drive current or tracking drive current from the outside to the linear elastic member, the focus drive force and tracking drive force are supplied to the print coil. The signal is generated so that the signal can be accurately read from the optical disk.
JP 2001-229555 A

  In the lens driving device described in Patent Document 1 described above, the connecting portion between the linear elastic member and the printed coil is provided at both ends of the printed coil.

  At both ends of the lens holder, thin arms are provided to absorb the vibration of the linear elastic member, and the objective lens is fixed when the linear elastic member, the lens holder and the actuator base are integrally molded. In many cases, the linear elastic members are arranged at both ends (outside) of the lens holder so that the lens holder is not inclined. Therefore, a connection portion between the printed coil and the linear elastic member is often provided near the arm.

  However, when performing soldering to electrically connect the linear elastic member and the printed coil, the arm portion having a small resin volume is exposed to a high temperature, and the heat capacity of the resin is reduced due to the small heat capacity of the resin. Damage was easy to be transmitted. In particular, a small pickup device is prone to problems because it cannot take measures such as thickening the arm.

  Accordingly, the present invention provides, for example, an actuator device that includes a printed coil and a linear elastic member in a lens housing portion molded of resin, and electrically connects the printed coil and the linear elastic member. It is an object of the present invention to provide an actuator device and a pickup device that can reduce thermal damage.

  In order to solve the above-mentioned problem, an invention according to claim 1 is directed to an objective lens, a lens housing portion that is molded of resin and that houses the objective lens, and a side surface of the lens housing portion that sandwiches the lens housing portion. In the actuator device comprising: a pair of coil parts attached to a linear elastic member that is integrally formed with the lens housing part and electrically connected to the coil part, the lens housing part comprises: A box portion that houses the objective lens; and a vibration suppression portion that protrudes from the box portion and suppresses vibrations of the linear elastic member, and the connection portion of the linear elastic member with the coil portion includes the box. It is characterized by being provided in the department.

  Hereinafter, an actuator device according to an embodiment of the present invention will be described. When an actuator device according to an embodiment of the present invention electrically connects a coil portion and a linear elastic member formed integrally with a lens housing portion, the connecting portion of the linear elastic member is a lens housing portion. Is provided in the box. By doing so, the resin volume of the lens housing portion in the vicinity of the connection portion is increased and the heat capacity is increased, so that temperature damage due to high temperature at the time of connecting the linear elastic member and the coil portion can be reduced.

  Moreover, a columnar part may be provided in the box part, and a connection part with the coil part of the linear elastic member may be provided in the columnar part. By doing in this way, since a columnar part can enlarge resin volume, it can enlarge heat capacity and can reduce the temperature damage by the high temperature at the time of joining of a linear elastic member and a coil part.

  In addition, a center-of-gravity adjustment unit may be provided in the lens housing unit so that the center of gravity of the lens housing unit is substantially equal to the lens center of the objective lens. By doing in this way, even if the center-of-gravity shift | offset | difference of the lens accommodating part by having provided the connection part with the said coil part of a linear elastic member in a box part can eliminate it.

  In addition, the center-of-gravity adjustment unit may be a second columnar part provided at a position facing each other across the center of gravity of the columnar part and the lens housing part. By doing in this way, even if the center-of-gravity shift | offset | difference of the lens accommodating part by having provided the connection part with the coil part of a linear elastic member in the box part can eliminate it.

  In addition, the center of gravity adjustment unit may be provided between the columnar part of the vibration suppressing unit and the lens housing part near the box part with the center of gravity interposed therebetween. By doing in this way, since the function of a gravity center adjustment part can be given to a vibration suppression part, it becomes unnecessary to shape | mold only the part of a gravity center adjustment part.

  The vibration suppressing unit may be provided so that the end near the box and the tip connected to the linear part of the linear elastic member sandwich the center of gravity of the lens housing part. By doing in this way, even if the amount of projection from the box portion of the vibration suppression unit is limited due to downsizing of the device or the like, the length of the vibration suppression unit can be configured to be longer, The effect of attenuating the vibration of the linear elastic member can be improved.

  Moreover, you may provide the actuator apparatus as described in any one of Claims 1 thru | or 6 in an optical pick-up apparatus. By doing so, the optical pickup can be provided with an actuator device that is less damaged by heat at the time of joining the coil portion and the linear elastic member, has an excellent center of gravity balance, and suppresses unnecessary vibration of the linear elastic member. . Therefore, the optical pickup can read the signal from the optical disc with high accuracy.

  A pickup apparatus 1 according to a first embodiment of the present invention will be described with reference to FIGS. The pickup device 1 is used for an optical disk reproducing device such as a CD and a DVD, and controls the distance between the recording surface of the optical disk and the objective lens against the warp or shake of the optical disk in order to read information recorded on the optical disk. Focus control and tracking control for controlling the objective lens to follow the eccentricity of the track of the optical disk are performed. FIG. 1 is a perspective view of a main part of a pickup device 1 according to a first embodiment of the present invention. As shown in FIG. 1, the pickup device 1 includes a pickup case 2 and an actuator device 3.

  The pickup case 2 has an actuator device 3 fixed thereto and accommodates optical components (not shown) such as a light source, a collimator lens, and a beam splitter. Further, the pickup case 2 can be moved along the radial direction of the optical disc on the shaft 20 shown in FIG. 1 by a motor (not shown) or a lead screw that transmits a driving force from the motor.

  As shown in FIG. 2, the actuator device 3 includes an actuator case 4 and an actuator movable portion 5.

  The actuator case 4 includes a magnet for moving a lens holder 9 (to be described later) of the actuator movable portion 5 in a focus or tracking direction, and a suspension base portion 10 of a holder suspension 8 (to be described later) of the actuator movable portion 5 is fixed. ing.

  As shown in FIGS. 2, 3, and 4, the actuator movable portion 5 includes an objective lens 6, a print coil 7, and a holder suspension 8.

  The objective lens 6 is a lens for irradiating the optical disc with the light emitted from the light source and passing through the optical component, and outputting the light reflected from the optical disc to the optical component.

  A pair of printed coils 7 as coil portions are attached to the side surface in the longitudinal direction of the lens holder 9 with an adhesive or the like across the lens holder 9 of the holder suspension 8. The print coil 7 has a coil wiring pattern formed on a substrate, and a focus control coil and a tracking control coil are formed respectively. The printed coil 7 is provided with a land 7a for electrical connection with a linear elastic member 11 (described later) by soldering at a position corresponding to the connecting portion of the linear elastic member 11.

  As shown in FIGS. 3 and 4, the holder suspension 8 includes a lens holder 9, a suspension base portion 10, and a linear elastic member 11. Here, FIG. 4 is a perspective view as seen from the back surface in the Z direction of FIG. 3, that is, when FIG. 3 is the front surface.

  The lens holder 9 as a lens housing portion is formed into a substantially box shape by a resin such as LCP (liquid crystal polymer), for example, and serves as a substantially box-shaped box portion 9h and a vibration suppressing portion protruding from the end of the box portion 9h. It is comprised from the fixed arm part 9d and the convex part 9e. An opening 9b for installing the objective lens 6 is provided in the approximate center of the top surface 9a of the box 9h. Further, the box portion 9h is provided with a columnar portion 9f erected from the back surface of the top surface portion 9a toward the bottom surface portion 9c of the box portion 9h.

  The suspension base portion 10 is formed in a substantially box shape by using a resin such as LCP (liquid crystal polymer), for example, in the same manner as the lens holder 9. The suspension base part 10 is provided with a fixing part 10a for fixing the actuator device 3 to the pickup case 2 with screws or the like at the end part. At both ends of the suspension base portion 10, linear elastic member fixing portions 10b for fixing the linear elastic member 11 are provided.

  The linear elastic member 11 has an elastic force such as a copper alloy and is formed of a material having good conductivity. The linear elastic member 11 connects the linear elastic member fixing portion 10b of the suspension base portion 10 and the fixing arm portion 9d of the lens holder 9 to each other. A linear portion 11a that movably supports the holder 9, a connection portion 11b that branches off from the linear portion 11a and is electrically connected to the printed coil 7, and further branches off from the connection portion 11b. A connecting portion 11c that is electrically connected to the printed coil exposed on the surface of 9f is provided. Further, the linear elastic member 11 is fixed to the linear elastic member fixing portion 10b of the suspension base portion 10 so as to penetrate the suspension base portion 10, and a portion through which the linear elastic member 11 passes is controlled by focus control or the like from the outside. The terminal 11d is supplied with a current for tracking control. That is, the linear elastic member 11 has not only a suspension function for the lens holder 9 but also a wiring function for supplying current to the printed coil 7.

  The lens holder 9, the suspension base portion 10, and the linear elastic member 11 are integrally formed when the lens holder 9 and the suspension base portion 10 are formed by insert molding. That is, as shown in FIGS. 3 and 4, one end of the linear portion 11a of the linear elastic member 11 is included in the linear elastic member fixing portion 10b of the suspension base portion 10, and the other end of the linear portion 11a and the connection portion are included. A part of 11b is included in the fixed arm part 9d, the convex part 9e, and the bottom part 9c of the lens holder 9, and the other part of the linear elastic member 11 is fixed in an exposed state.

  As shown in FIG. 5, the printed coil 7 attached to the lens holder 9 is electrically connected by being soldered to the connecting portions 11 b and 11 c of the linear breakable member 11. The connection portion 11c is provided so as to be flush with the surface of the columnar portion 9f of the lens holder 9 (there is no step on the same plane). And the land 7a of the printed coil 7 and the connection part 11c of the linear breakable member 11 are connected so as to be bridged with solder.

  The columnar portion 7f as a connecting portion with the coil portion of the linear elastic member 11 has a larger heat capacity because the volume of the resin is larger than that of the fixed arm portion 9d and the convex portion 9e, and is caused by thermal damage during soldering. Resin deformation is unlikely to occur.

  In the actuator device 3 having such a configuration, when a focus driving current or a tracking driving current is supplied to the terminal 11d of the linear elastic member 11 fixed to the suspension base portion 10 of the holder suspension 8, the linear disconnecting member Since the current flows through the print coil 7 via 11, the driving force in the focus direction and the driving force in the tracking direction can be generated, thereby moving the objective lens 6 so that the signal of the optical disk can be read accurately. Can do.

  According to the present embodiment, when the linear elastic member 11 of the holder suspension 8 of the actuator movable portion 5 and the printed coil 7 of the actuator device 3 of the pickup device 1 are electrically connected by soldering or the like, the linear shape is obtained. The connecting portion 11 c of the elastic member 11 is provided on the columnar portion 9 f of the lens holder 9 in which the linear elastic member 11 is insert-molded, and is connected to the land 7 a of the printed coil 7. By doing so, the columnar part 9f has a larger heat capacity than the vicinity of the fixed arm part 9d and the convex part 9e where the connection part between the printed coil 7 and the linear elastic member 11 is conventionally provided. Damage caused by can be reduced.

  Next, an actuator device 3 according to a second embodiment will be described with reference to FIGS. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. FIG. 7 is a perspective view of the actuator movable portion 5 as viewed from the direction of arrow Y in FIG. 6, that is, from the direction of the printed coil 7.

  In this embodiment, as shown in FIGS. 6 and 7, the first feature is that a weight balance portion 9g as a gravity center adjusting portion is provided on the lens holder 9 of the holder suspension 8 of the actuator movable portion 5 of the actuator device 3. This is different from the embodiment.

  The lens holder 9 needs to have a center of gravity at the center of the objective lens 6 in order to accurately read a signal from the optical disk. Therefore, when the center of gravity of the lens holder 9 is displaced by the columnar portion 9f provided in the first embodiment, a position that is symmetric with respect to the lens center, that is, the center of gravity of the columnar portion 9f and the lens holder 9 is sandwiched. The center of gravity is prevented from shifting by providing the weight balance portion 9g as the second columnar portion at the opposite position.

  According to the present embodiment, since the weight balance portion 9g is provided in the lens holder 9 so that the center of gravity of the lens holder 9 is located at the lens center of the objective lens, it is possible to prevent the shift of the center of gravity due to the columnar portion 9f.

  Next, an actuator device 3 according to a third embodiment will be described with reference to FIGS. The same parts as those in the first and second embodiments described above are denoted by the same reference numerals and description thereof is omitted. FIG. 9 is a perspective view as viewed from the back side in the direction of arrow Z in FIG.

  In this embodiment, as shown in FIGS. 8 and 9, the shape of the fixed arm portion 9d ′ and the convex portion 9e ′ of the lens holder 9 of the holder suspension 8 of the actuator movable portion 5 of the actuator device 3 is the first implementation. Molded differently from the example.

  The fixed arm portion 9d 'is shortened to have a shape like the convex portion 9e of the first embodiment, and the convex portion 9e' as the center of gravity adjusting portion is extended in length to form a linear elastic member at the tip portion. It is formed in a crank shape so that the end portions of the 11 linear portions 11a are connected. The convex portion 9 e ′ is provided so as to sandwich the center of gravity of the lens holder 9, and the shape thereof is formed so that the center of gravity of the lens holder 9 is the lens center of the objective lens 6.

  In this way, the convex portion 9e ′ is extended in a crank shape, so that vibration of the linear elastic member 11 can be suppressed, and the center of gravity can be balanced by providing the columnar portion 9f. Become. That is, the center-of-gravity adjusting unit is provided at the end of the vibration suppressing unit near the box with the center of gravity of the lens holder 9 interposed therebetween.

  According to the present embodiment, the fixed arm portion 9d 'of the lens holder is shortened and the convex portion 9e' is formed to extend in a crank shape, whereby the vibration suppressing portion can also have the function of the center of gravity adjusting portion. Furthermore, even if the amount of protrusion of the vibration suppressing portion from the box portion 9h is limited due to downsizing of the actuator device or the like, the tip portion is provided with the center of gravity of the lens holder 9 from the end portion close to the box portion to provide the convex portion 9e ′. By making the length longer, it is possible to improve the effect of the convex portion 9e ′ damping the vibration of the linear elastic member 11 while maintaining the balance of the center of gravity.

  In the above-described embodiment, a columnar portion 9f having a large heat capacity is provided in the box portion 9h only in a portion where the influence of thermal damage is particularly large, and the connection portion 11c is moved there. As for the part 11b, a connecting part may be provided in the box part 9h.

  According to the embodiment described above, the following actuator device can be obtained.

(Additional remark 1) The objective lens 6, the lens holder 9 which shape | molds and accommodates the objective lens 6, a pair of printed coil 7 attached to the side surface of the lens holder 9 on both sides of the lens holder 9, and the lens holder 9 In the actuator device 3 including the linear elastic member 11 that is integrally formed with the printed coil 7 and electrically connected to the printed coil 7,
The lens holder 9 includes a box portion 9h that houses the objective lens 6, and a vibration suppressing portion 9d that protrudes from the box portion 9h and suppresses the vibration of the linear elastic member 11,
The actuator device 3 is characterized in that a connecting portion 11c of the linear elastic member 11 with the printed coil 7 is provided in the box portion 9h.

  According to this actuator device 3, since the heat capacity of the lens holder 9 in the vicinity of the connecting portion 11c is increased, temperature damage due to a high temperature at the time of joining the linear elastic member 11 and the printed coil 7 can be reduced.

  In addition, the Example mentioned above only showed the typical form of this invention, and this invention is not limited to an Example. That is, various modifications can be made without departing from the scope of the present invention.

It is a principal part perspective view of the optical pick-up apparatus concerning the 1st Example of this invention. It is a principal part perspective view of the actuator apparatus concerning 1st Example of this invention. It is a perspective view of the actuator movable part of the actuator apparatus shown by FIG. It is the perspective view which looked at the actuator movable part shown by FIG. 3 from the Z direction. It is sectional drawing which follows the II line | wire of FIG. It is a perspective view of the actuator movable part of the actuator apparatus concerning 2nd Example of this invention. It is the perspective view which looked at the actuator movable part shown by FIG. 6 from the Y direction. It is a perspective view of an actuator movable part of an actuator device concerning the 3rd example of the present invention. It is the perspective view which looked at the actuator movable part shown by FIG. 8 from the Z direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus 3 Actuator apparatus 6 Objective lens 7 Print coil (coil part)
9 Lens holder (lens housing part)
9d Fixed arm part (vibration suppression part)
9d 'Fixed arm part (vibration suppression part)
9e Convex part (vibration suppression part)
9e 'convex part (vibration suppression part, center of gravity adjustment part)
9f Columnar portion 9g Weight balance portion (center of gravity adjustment portion, second columnar portion)
9h Box part 11 Linear elastic member 11c Connection part (connection part with coil part of linear elastic member)

Claims (7)

An objective lens, a lens housing portion that is molded of resin and houses the objective lens, a pair of coil portions attached to the side surface of the lens housing portion with the lens housing portion interposed therebetween, and the lens housing portion integrally In an actuator device comprising a linear elastic member that is molded and electrically connected to the coil part,
The lens housing portion includes a box portion that houses the objective lens, and a vibration suppression portion that protrudes from the box portion and suppresses vibration of the linear elastic member,
An actuator device, wherein a connection portion between the linear elastic member and the coil portion is provided in the box portion.   2. The actuator device according to claim 1, wherein a columnar portion is provided in the box portion, and a connection portion with the coil portion of the linear elastic member is provided in the columnar portion.   The actuator device according to claim 2, wherein the lens housing portion includes a center-of-gravity adjusting portion that makes the center of gravity of the lens housing portion substantially equal to the lens center of the objective lens.   4. The actuator device according to claim 3, wherein the center-of-gravity adjusting portion is a second columnar portion provided at a position facing each other across the center of gravity of the columnar portion and the lens housing portion.   4. The actuator device according to claim 3, wherein the center-of-gravity adjusting unit is an end portion of the vibration suppressing unit that is provided near the center of gravity of the columnar unit and the lens housing unit.   The vibration suppressing portion is provided with an end portion close to the box portion and a tip portion connected to the linear portion of the linear elastic member so as to sandwich the center of gravity of the lens housing portion. Item 6. The actuator device according to Item 5.   An optical pickup device comprising the actuator device according to claim 1.

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