JP2007066348A - Optical pickup actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a slim moving section of an optical pickup actuator while reducing its horizontal dimension. <P>SOLUTION: This optical pickup actuator has a moving section 11 having an objective lens to focus a laser beam on the recording surface of an optical disk, a focusing coil 26 disposed in the moving section 11 to drive it toward the recording surface of the optical disk, and a tilting coil 27 disposed in the moving section 11 to tilt it toward the recording surface of the optical disk. The focusing coil 26 and the tilting coil 27 form an air core coil 25. In the air core coil 25, the tilting coil 27 is set inside, and the focusing coil 26 is set outside. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical pickup actuator for use in an optical disc apparatus or the like for reading laser-focused laser light on an optical disc recording surface and reading information recorded on the optical disc or recording information on the optical disc. About.

  In recent years, with the widespread use of DVDs and the like, optical disk devices have been increased in speed of optical disk rotation and reduction in recording pits in accordance with high-density recording and reading. Along with this, an optical pickup for condensing the laser beam that passes through the objective lens while appropriately adjusting the minute deviation of the rotating optical disc must also support high-frequency driving. Further, the optical disc apparatus is required to be reduced in size and thickness. In order to meet such a demand, the optical pickup actuator for driving the objective lens for irradiating the optical disk is also required to be reduced in size and thickness.

  A conventional optical pickup actuator is disclosed in Patent Document 1 in which a focus coil and a tilt coil are arranged so as to overlap each other in the height direction so as to reduce the size of the optical pickup actuator.

Japanese Patent Laying-Open No. 2004-234832 (FIG. 7)

  However, in the optical pickup actuator disclosed in Patent Document 1, since the focus coil and the tilt coil are arranged so as to overlap each other in the height direction, compared with the case where these two coils are arranged separately and independently, Although the size can be suppressed, the size in the height direction cannot be suppressed, and there is a problem that the movable part in the optical pickup actuator cannot be thinned.

  The present invention has been made based on the above circumstances, and an object of the present invention is to provide an optical pickup actuator capable of reducing the thickness of the movable part while suppressing the horizontal dimension of the movable part. Is.

  In order to solve the above problems, the present invention provides a movable part having an objective lens for condensing laser light on the recording surface of an optical disk, and the movable part disposed in the movable part, and the movable part is directed to the recording surface of the optical disk. The focus coil and the tilt coil constitute an air-core coil. The optical pickup actuator has a focus coil that is driven by a tilt coil and a tilt coil that is disposed on the movable portion and tilts the movable portion with respect to the recording surface of the optical disc. In the air-core coil, one of the coils is arranged on the inner side and the other is arranged on the outer side.

  In such a configuration, in the air-core coil arranged in the movable part, either the focus coil or the tilt coil is arranged on the inner side, and the other is arranged on the outer side. Compared with the case where it arrange | positions, the dimension of a height direction can be made small, suppressing the dimension of the horizontal direction of the whole movable part. As a result, the movable part can be thinned. Further, as the optical pickup actuator becomes thinner, the optical pickup actuator becomes lighter and the sensitivity is improved.

  According to the present invention, it is possible to reduce the thickness of the movable part while suppressing the horizontal dimension of the movable part of the optical pickup actuator.

  Hereinafter, an optical pickup actuator 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the configuration of the optical pickup actuator 10. FIG. 2 is an exploded perspective view showing the configuration of the movable portion 11 in the optical pickup actuator 10. FIG. FIG. 4 is a diagram illustrating a configuration of an air-core coil 25 in the optical pickup actuator 10, wherein (a) is a perspective view illustrating a case where a tilt coil 27 is disposed on the inner side and a focus coil 26 is disposed on the outer side; FIG. 6 is a perspective view showing a case where a focus coil 26 is arranged on the inner side and a tilt coil 27 is arranged on the outer side. FIGS. 4A and 4B are views showing a side surface of the optical pickup actuator 10 of FIG. 1, wherein FIG. 4A is a left side view thereof, and FIG. 4B is a right side view thereof. 5 is a plan view of the optical pickup actuator 10 of FIG. 1, and FIG. 6 is a front view of the optical pickup actuator 10 of FIG. 7 is a diagram for explaining the operation of each of the coils 26, 27, and 28 used in the optical pickup actuator 10 of FIG. 1, and (a) is a schematic diagram showing the operation of the focus coil 26. FIG. 4B is a schematic diagram illustrating the operation of the tilt coil 27, and FIG. 4C is a schematic diagram illustrating the operation of the tracking coil 28. In the following description, the one end side refers to the upper left side in FIGS. 1 and 2, and the other end side refers to the lower right side. 1 and 2 are referred to as the left side and the upper right side as the right side. In FIG. 4, one end side indicates the left side and the other end side indicates the right side. FIG. 1 shows a case where the conductive fusing materials 34 and 38 are not injected. In the following drawings, the terminal lines of the coils 26, 27, and 28 are not shown.

  As shown in FIG. 1, the optical pickup actuator 10 includes a lens holder 12, focus coils 26a and 26b, tilt coils 27a and 27b and tracking coils 28a to 28d for controlling the attitude of the lens holder 12, a connection substrate 30, It is mainly composed of a support substrate 37 that supports the lens holder 12 and support wires 35 that are six support members that support the lens holder 12 so that the lens holder 12 can move relative to the support substrate 37. Note that a portion constituted by the lens holder 12, the three types of coils 26, 27, and 28 and the connection substrate 30 is referred to as a movable portion 11. The optical pick-up device 10 is a device that records or reproduces information on or from an optical disc by condensing light with an objective lens 19 described later on a recording surface of an optical disc (not shown).

  The lens holder 12 is a portion that is magnetically driven in the optical pickup actuator 10, and includes a holder portion 12a and storage portions 12b and 12c provided on the left and right sides thereof. The holder portion 12a is provided in the central portion of the lens holder 12, and an objective lens 19 for condensing light on the recording surface of the optical disc is provided at the center. Further, a total of three pin fitting holes for preventing disk collision are provided in the vicinity of both side portions on the other end side and in the vicinity of the central portion on one end side of the holder portion 12a. Pins 21 for preventing disk collision are respectively screwed. For this reason, it is possible to avoid direct contact when the optical disk and the objective lens approach each other. The storage portions 12b and 12c are provided on the left and right sides of the holder portion 12a. The storage portions 12b and 12c are frame-shaped frame members 12d and 12e extending in a direction perpendicular to the side surface from above the left and right side surfaces of the holder portion 12a, and the left side of the holder 12a. The flat bottom surfaces 12f and 12g extending in the direction perpendicular to the side surface from the lower side of the right side surface, and the end surfaces of the frame members 12d and 12e and the end surfaces of the bottom surfaces 12f and 12g are connected to each other. Side surfaces 12h and 12i. Further, the frame members 12d and 12e, the bottom surfaces 12f and 12g, and the side surfaces 12h and 12i in the storage portions 12b and 12c are integrally formed (see FIG. 2).

  As shown in FIG. 1, air-core coils 25a and 25b are disposed inside the storage portions 12b and 12c. Air-core coils 25a and 25b (hereinafter, air-core coils 25a and 25b are collectively referred to as air-core coils 25) move the lens holder 12 in the focus direction (arrow XX direction in FIG. 6). Focus coils 26a and 26b to be moved (hereinafter referred to as focus coil 26 when the focus coils 26a and 26b are collectively referred to) and a tilt for tilting the lens holder 12 in the tilt direction (the arrow ZZ direction in FIG. 6). Coils 27a and 27b (hereinafter referred to as tilt coil 27 when tilt coils 27a and 27b are collectively referred to) are composed of two types of coils.

  In the present embodiment, in the air-core coil 25, a tilt coil 27 is disposed on the inner side, and a focus coil 26 is disposed on the outer side (see FIG. 3A). Further, since the tilt coil 27 does not require high sensitivity when compared with the focus coil 26, the number of turns of the tilt coil 27 is smaller than the number of turns of the focus coil 26. In the present embodiment, as the focus coil 26 and the tilt coil 27, a heat-sealing wire having a film formed on its surface is employed. Further, the focus coil 26 may be disposed inside the air-core coil 25 and the tilt coil 27 may be disposed outside thereof (see FIG. 3B).

  The focus coils 26a and 26b constituting the air-core coils 25a and 25b arranged in the storage portions 12b and 12c are made of a single conductor. Further, the tilt coils 27a and 27b are also made of a single conducting wire. That is, in the state where the tilt coil 27 is disposed inside the focus coil 26, the focus coil 26a and the focus coil 26b and the tilt coil 27a and the tilt coil 27b disposed in the storage portions 12b and 12c are connected to each other. For example, as shown in FIGS. 7 (a) and 7 (b), when viewed from above the optical axis of the objective lens 19, the winding in the clockwise direction (arrow D1 direction) is forward or counterclockwise. If the winding in the rotating direction (arrow D2 direction) is reversed, the left and right focus coils 26a, 26b are both forward wound and wound in the same direction. Further, as shown in FIG. 7B, the left tilt coil 27a is forward wound, the right tilt coil 27b is reverse wound, and the left and right tilt coils 27a and 27b are wound in opposite directions. Yes. The air core coils 25 a and 25 b are both arranged such that the direction of the winding axis is the same as the optical axis of the objective lens 19.

  Two tracking coils 28a, 28d wound in a winding shape that moves the lens holder 12 in the tracking direction (the Y-Y direction in FIG. 6) are provided on the other side of the air-core coils 25a, 25b. Are arranged, and two tracking coils 28b and 28c wound in a winding shape are also arranged on the side surfaces on one end side of the air-core coils 25a and 25b, respectively. The four tracking coils 28a, 28b, 28c, 28d (hereinafter referred to as the tracking coil 28 when the tracking coils 28a, 28b, 28c, 28d are collectively referred to) are made of a single continuous wire. As shown in FIG. 7C, each of the tracking coils 28a and 28c is a normal winding (in the direction of arrow D1) when viewed from the front (when the optical pickup actuator 10 is viewed from the other end side to the one end side). The tracking coils 28b and 28d are each reversely wound (in the direction of arrow D2) when viewed from the front.

  Also, the coil end wires are drawn from the tracking coils 28a and 28d, and the tracking coil 28 is sequentially wound from the tracking coil 28a to the tracking coil 28d via the tracking coils 28b and 28c as described above. . Each winding axis of the tracking coils 28a, 28b, 28c, 28d is coaxial with the AA axis in FIG. Note that the winding order of the tracking coils 28a, 28b, 28c, 28d is not particularly limited when the regularity in the direction of the winding axis is satisfied.

  Connection boards 30a and 30b (hereinafter referred to as connection board 30 when the connection boards 30a and 30b are collectively referred to) are respectively attached to the left side of the storage part 12b and the right side of the storage part 12c. The attachment of the connection boards 30a and 30b to the storage portions 12b and 12c is performed by fixing the flat surface 30c inside the connection boards 30a and 30b to the outside of the side surfaces 12h and 12i of the storage portions 12b and 12c with an adhesive ( (See FIG. 2). As shown in FIGS. 1, 2, and 4, the connection substrates 30a and 30b are substantially rectangular planar substrates. Of the end faces perpendicular to the plane portion 30d corresponding to the substrate surface, the end face 30e located on the other end side in FIGS. 1 and 4 has a total of three semicircular cutouts. Side terminals 31 are provided. The two connection boards 30a and 30b have the same shape, and are arranged symmetrically on the outer sides of the side surfaces 12h and 12i of the storage portions 12a and 12b. Each side terminal 31 is formed as a conductive terminal by forming a conductive pad on the entire inner surface of the concave shape.

  As shown in FIGS. 1 and 4, three plane fixing portions 32 are provided in the approximate center of the plane portion 30 d of the connection substrate 30 so as to be arranged from the upper side to the lower side. The lands 33 are connected to be conductive.

  The terminal wires drawn from the focus coils 26a and 26b and the tilt coils 27a and 27b and the terminal wires drawn from the tracking coils 28a and 28d, respectively, are connected to the side surfaces 12h and 12i of the storage portions 12b and 12c, respectively. A conductive fusing material 34 is connected to each side terminal 31 of the substrates 30a and 30b so as to be conductive. In the present embodiment, solder is used as the conductive fusing material 34. Since the terminal wire of each coil is connected to each side terminal 31 so that the conductive fusion material 34 does not protrude from the recess of each side terminal 31, the solder extends to the flat portion 30 d of the connection substrate 30. Never exist.

  The six support wires 35 are conductive wires, and elastically hold the movable portion 11 and electrically connect the support substrate 37 and the connection substrate 30. The support substrate 37 is a substrate having a rectangular shape, and three circular holes 37a are vertically arranged in the vicinity of both left and right ends thereof. One end of the support wire 35 is inserted into a hole 37 a provided in the support substrate 37, and is fixed to the support substrate 37 with a conductive adhesive. On the other hand, three other ends of the support wires 35 are fixed to the left and right side surfaces of the connection substrates 30a and 30b, respectively. Each support wire 35 can be bent. For this reason, the movable part 11 is not fixed to the support substrate 30 but can be moved.

  As described above, the other end of the support wire 35 is connected to the side surfaces of the connection substrates 30a and 30b. That is, as shown in FIGS. 4A and 4B, the other end of the support wire 35 is connected to the plane fixing portion 32 provided on the plane portion 30d of the connection substrates 30a and 30b, respectively. A conductive material 38 is connected to be conductive. Since it is comprised in this way, the electroconductive fusion material 38 in each connection part protrudes in the left-right direction in FIG. In the present embodiment, solder is used as the conductive fusing material 38.

  Further, the plane fixing part 32 can be electrically connected to the side terminal 31 via the land 33. In addition, the terminal wires of the focus coil 26, the tilt coil 27, and the tracking coil 28 are orthogonal to the longitudinal direction of the support wire 35 (in some cases, the side terminals 31 are slightly inclined with respect to the longitudinal direction of the wire 35. It is connected so as to be conductive. As described above, the support wire 35 is electrically connected to the terminal line of the focus coil 26, the terminal line of the tilt coil 27, and the terminal line of the tracking coil 28, respectively.

  In the present embodiment, as shown in FIG. 5, six yokes 40 a to 40 f are arranged in the optical pickup actuator 10. Inner yokes 40a and 40b of yokes 40a to 40f are made of metal plates. The yokes 40 a to 40 f are provided so as to protrude from the base of the optical pickup actuator 10 in a direction perpendicular to the base. The yokes 40a and 40b are disposed so as to be inserted through hollow portions formed inside the air-core coils 25a and 25b, respectively. A gap is provided over the entire circumference between the yokes 40a and 40b and the air-core coils 25a and 25b. The yokes 40c, 40d and the yokes 40e, 40f are arranged so as to face each other with the lens holder 12 interposed therebetween, and the yokes 40c, 40d, 40e, 40f are respectively tracking coils 28a, 28d, 28b, 28c. It arrange | positions so that it may become a positional relationship which opposes.

  A permanent magnet 42 is fixed to each yoke 40c, 40d, 40e, 40f by an adhesive or the like, and the permanent magnet 42 is fixed so as to face the tracking coils 28a, 28d, 28b, 28c. . Each permanent magnet 42 is arranged such that the side facing the tracking coils 28a, 28d, 28b, 28c is the N pole, and the side fixed to the yokes 40c, 40d, 40e, 40f is the S pole.

  By arranging the yokes 40a and 40b and the permanent magnet 42 in this way, the lines of magnetic force generated from the two permanent magnets 42 arranged to face one end in FIG. 5 are concentrated on the yoke 40a. The magnetic field lines form a magnetic path between the permanent magnet 42 and the yoke 40a. Similarly, the magnetic lines of force generated from the two permanent magnets 42 arranged to face the other end are also concentrated on the yoke 40b, and the magnetic lines of force also form a magnetic path between the permanent magnet 42 and the yoke 40b. To do. Therefore, these magnetic paths surely pass through the focus coil 26, the tilt coil 27, and the tracking coil 28. Accordingly, the drive current applied to each of the coils 26, 27, and 28 acts to drive the lens holder 12 in the focus direction, tilt direction, and tracking direction.

  Next, the operation of the optical pickup actuator 10 will be described.

  First, in the optical disc apparatus, the optical pickup actuator 10 is moved to a desired position by the moving mechanism while the optical disc is being rotationally driven by the drive motor. Then, the laser beam generated in the optical system is condensed on the recording surface of the optical disc by the objective lens 19 to record and reproduce information on the optical disc. When controlling the state of the optical pickup actuator 10 (the posture of the objective lens 19), the detection result relating to the inclination of the recording surface of the optical disc detected by the photodetector is converted into an electrical signal by the conversion unit, and the control unit Output as an electrical signal. The control unit adjusts the direction of the objective lens 19 by flowing controlled currents to the focus coil 26, the tilt coil 27, and the tracking coil 28 based on the electrical signal output from the conversion unit.

  When the objective lens 19 is moved in the focus direction, for example, as shown in FIG. 7A, the control unit moves the focus coils 26a and 26b in the positive direction (the direction indicated by the arrow D1 in FIG. 7A). Supply control current. The control current is supplied to the focus coil 26 via the support wire 35 and the connection substrate 30. Then, a positive current supplied to the focus coils 26a and 26b and a magnetic force line K generated from the N pole of the permanent magnet 42 act, and both the focus coils 26a and 26b are in the same downward direction (see FIG. The force in the direction of arrow F1 in 7 (a) acts. For this reason, the lens holder 12 moves in the focus direction (direction indicated by arrow XX in FIG. 6) with respect to the optical disc, and the position of the objective lens 19 in the focus direction is finely adjusted.

  Similarly, when the objective lens 19 is moved in the tilt direction, for example, as shown in FIG. 7B, the control unit moves the tilt coil 27a in the positive direction (the direction indicated by the arrow D1 in FIG. 7B). And the control current of the reverse direction (arrow D2 direction in FIG.7 (b)) is supplied to the tilt coil 27b. The control current is sequentially supplied to the tilt coils 27 a and 27 b via the support wire 35 and the connection substrate 30. Then, a positive current supplied to the tilt coil 27a and a magnetic force line K generated from the N pole of the permanent magnet 42 act, and the tilt coil 27a is moved downward (in the direction indicated by arrow F1 in FIG. 7B). The force of acts. On the other hand, the reverse current supplied to the tilt coil 27a and the magnetic force line K generated from the N pole of the permanent magnet 42 act on the tilt coil 27b, and above (in the direction indicated by arrow F2 in FIG. 7B). The force to act. Thus, forces in opposite directions act between the tilt coils 27a and 27b. Therefore, a moment in the direction indicated by the arrow Z in FIG. 6 is generated. With this moment, the lens holder 12 is tilted with respect to the optical disc, and the position of the objective lens 19 in the tilt direction is finely adjusted.

  When the objective lens 19 is moved in the tracking direction, for example, as shown in FIG. 7C, the control unit moves the tracking coils 28a and 28c in the positive direction (the direction indicated by the arrow D1 in FIG. 7C). ) And the tracking coils 28b and 28d are supplied with a control current in the reverse direction (in the direction of arrow D2 in FIG. 7C). The control current is sequentially supplied to the tracking coils 28a, 28b, 28c, and 28d via the support wire 35 and the connection substrate 30. Then, a positive current supplied to the tracking coils 28a and 28c and a magnetic force line K generated from the N pole of the permanent magnet 42 act, and the tracking coils 28a and 28c are applied to the right direction (arrows in FIG. 7C). A force in the direction indicated by F3 acts. In addition, the tracking coils 28b and 28d are subjected to a current in the reverse direction supplied to the tracking coils 28a and 28c and a magnetic force line K generated from the N pole of the permanent magnet 42, to the right (in FIG. 7C). A force in the direction of arrow F3) acts. In this way, forces in the same direction act between the tracking coils 28a, 28b, 28c, and 28d. For this reason, the lens holder 12 moves in the tracking direction (YY direction in FIG. 6) with respect to the optical disc, and the position of the objective lens 19 in the tracking direction is finely adjusted. As described above, in the optical pickup actuator 10, it is possible to finely adjust the position of the objective lens 19 by moving the lens holder 12 in the three axial directions of the focus direction, the tilt direction, and the tracking direction with respect to the optical disc. Therefore, the state of the optical pickup actuator 10 with respect to the optical disk can be controlled with high accuracy.

  In the optical pickup actuator 10 configured as described above, the focus coil 26 is disposed outside the air-core coil 25 disposed in the movable portion 11, and the tilt coil 27 is disposed inside thereof. Thus, by arranging two types of coils 26 and 27 in one place, compared with the case where both coils 26 and 27 are separately arranged, while suppressing the horizontal dimension of the entire movable part 11, The dimension in the height direction can be reduced. For this reason, the movable part 11 can be thinned. Further, as the optical pickup actuator 10 is made thinner, the optical pickup actuator 10 is reduced in weight and the sensitivity is improved. Further, by increasing the thickness of the focus coil 26 and the tilt coil 27, the height of the air core coil 25 can be reduced without changing the prescribed number of turns of each coil, and the winding of the air core coil 25 can be reduced. Since the thickness increases, high rigidity can be obtained.

  Further, in the optical pickup actuator 10, terminal lines (not shown) of the focus coil 26, the tilt coil 27, and the tracking coil 28 can be connected by the end face 30 e serving as the side terminal 31 provided on the connection board 30. The conductive fusion material 34 for connection does not protrude from the connection substrate 30. For this reason, the risk that the support wire 35 comes into contact with the conductive fusion material 34 for the terminal wires of the coils 26, 27, 28 is reduced, and the support wire 35 can be brought closer to the connection substrate 30. Therefore, the horizontal dimension of the optical pickup actuator 10 can be reduced. Further, when the lateral dimension is the same as the conventional size, the space between the support wire 35 and the connection substrate 30 can be increased, and the generation of this space improves the degree of freedom in designing the optical pickup actuator 10. In addition, the conductive fusion material 38 is reduced, the optical pickup actuator 10 is reduced in weight, and the sensitivity of the optical pickup actuator 10 is improved as compared with the conventional structure in which a large amount of the conductive fusion material 38 is used to save space. . Furthermore, since the terminal lines of the coils 26, 27, and 28 are connected by the end face 30e of the connection board 30, there is no part that bends greatly, making it difficult to disconnect.

  Further, since the terminal wires of the coils 26, 27, and 28 are connected by the end face 30 e of the connection substrate 30, the conductive fusion material 34 used for connecting the terminal wires of the coils 26, 27, and 28 is connected to the connection substrate 30. It no longer exists in the plane part 30d. Therefore, the risk that the conductive fusion material 34 comes into contact with the support wire 35 is greatly reduced. Thereby, the occurrence of malfunction due to contact is reduced, and the risk of short-circuiting the terminal wires of the coils 26, 27, and 28 and the support wire 35 is reduced. Further, since the side terminal 31 is provided with a recess, it is possible to prevent the conductive fusion material 34 from flowing to other parts and to easily maintain the positions of the terminal wires of the coils 26, 27 and 28. Then the fixing work is simplified.

  Although one embodiment of the present invention has been described above, the present invention can be variously modified as follows.

  In the above-described embodiment, the clockwise winding as viewed from above the optical axis of the objective lens 19 is a forward winding, and the counterclockwise winding is a reverse winding. The winding in the rotating direction is reverse winding, the winding in the counterclockwise direction is normal winding, and the winding directions of the coils 26a, 26b, 27a, 27b are opposite to those in the above-described embodiments. You may make it do. Similarly, the winding method of the coils 28a, 28b, 28c, 28d may be reversed. Further, the directions of the N pole and the S pole of the permanent magnet 42 and the winding directions of the coils 26, 27, and 28 may be appropriately changed within a range that satisfies the above-described position control.

  In the above-described embodiment, the lens holder 12 is provided with a total of eight coils including the focus coils 26a and 26b, the tilt coils 27a and 27b, and the tracking coils 28a, 28b, 28c, and 28d. These coils may be omitted, or a single focusing coil may be used. That is, the number of coils is not limited to eight, but may be seven or less, or nine or more. The focus coil, tilt coil, and tracking coil may be formed by winding or a film coil that forms a coil pattern on a film.

  Further, the optical pickup actuator 10 according to the above-described embodiment is mainly employed in the inner yoke type, but is not limited to this, for example, an open magnet type actuator using only the force of the open magnetic flux of the permanent magnet 42, Alternatively, the yoke may be used in an opposing magnet type actuator that is disposed so as to be sandwiched between two opposing magnets.

  In the above-described embodiment, the movable part 11 is supported by a total of six support wires 35. However, the present invention is not limited to this, and the support wires correspond to the number of coils arranged in the movable part 11. The total number of the left and right two may be four, or the left and right four may be a total of eight. In addition to the conductive support wire, one or more support wires for holding only may be added. Thus, the number of support wires may be 5 or less, or may be 7 or more. Moreover, although each support wire 35 is arrange | positioned horizontally along the AA axial direction, you may arrange | position so that it may incline with respect to an AA axial direction. In this case, it is necessary to provide the hole 37a appropriately adapted to the wire 35.

  Further, in the above-described embodiment, each side terminal 31 has a semicircular shape in cross section. However, the shape is not limited to this, and a slope-shaped shape, an L-shaped shape, and a U-shaped shape are other shapes. It may be a letter shape or a semi-elliptical shape. In addition, a configuration in which one or two side terminals 31 in the connection substrate 30 are used and a part of the side terminals 31 is the side terminal 31 may be applied.

  In the above-described embodiment, the permanent magnet 42 is disposed so as to face the AA axis direction. However, the permanent magnet 42 is disposed in a direction perpendicular to the AA axis direction. May be. In this case, it is necessary to wind the winding corresponding to the magnetic circuit formed by the permanent magnet 42.

  In the above-described embodiment, three side terminals 31 are formed only on the end surface 30e of the connection substrate 30, but the present invention is not limited to this. For example, two side terminals 30 are provided on the end surface 30e, and the end surface 30e is provided. It is also possible to disperse and provide one on the two opposing end surfaces of the connection substrate 30 so that one is provided on the opposite end surface.

  The optical pickup actuator of the present invention can be applied to all devices for operating an optical system such as a lens, and can be particularly preferably used in various sound reproducing devices or image reproducing devices such as a CD player and a DVD player. .

It is a perspective view which shows the structure of the optical pick-up actuator which concerns on one embodiment of this invention. It is a disassembled perspective view which shows the structure of the movable part in the optical pick-up actuator of FIG. It is a figure which shows the structure of the air-core coil used for the optical pick-up actuator which concerns on one embodiment of this invention, (a) is a perspective view which shows the case where a tilt coil is arrange | positioned inside and a focus coil is arrange | positioned on the outer side It is a figure and (b) is a perspective view which shows the case where a focus coil is arrange | positioned inside and a tilt coil is arrange | positioned on the outer side. It is a figure which shows the side surface of the optical pick-up actuator of FIG. 1, (a) is the left view, (b) is the right view. It is a top view of the optical pick-up actuator of FIG. It is a front view of the optical pick-up actuator of FIG. FIG. 2 is a diagram for explaining the operation of each coil used in the optical pickup actuator of FIG. 1, (a) is a schematic diagram illustrating the operation of the focus coil, and (b) is a schematic diagram illustrating the operation of the tilt coil. It is a figure and (c) is the schematic which shows operation | movement of a tracking coil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Optical pick-up actuator 11 ... Movable part 12 ... Lens holder 19 ... Objective lens 25 ... Air core coil (corresponding to the coil wound by air core)
26 (26a, 26b) ... focus coil 27 (27a, 27b) ... tilt coil 28 (28a, 28b, 28c, 28d) ... tracking coil

Claims (1)

A movable part having an objective lens for condensing laser light on the recording surface of the optical disc;
A focus coil disposed on the movable part and driving the movable part in the direction of the recording surface of the optical disc;
A tilt coil disposed on the movable part and tilting the movable part with respect to the recording surface of the optical disc;
In an optical pickup actuator having
The focus coil and the tilt coil constitute an air-core coil, wherein one of the coils is disposed on the inner side and the other coil is disposed on the outer side. Optical pickup actuator.

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