JP4387981B2 - Optical pickup device - Google Patents

Description

  The present invention relates to an optical pickup device.

  A conventional optical pickup device is disclosed in Patent Document 1. The optical pickup device disclosed in Patent Document 1 includes an objective lens, an actuator, and a housing. The objective lens condenses and irradiates the laser beam emitted from the laser diode onto the recording surface of the disk. The actuator includes a drive source for driving the objective lens to be displaced, and a base portion on which the drive source is mounted, and is held by a holding portion formed in the housing.

  The drive source of the actuator is an objective lens so that the laser beam condensed and irradiated by the objective lens coincides with the recording surface of the disc in response to the supply of current from the drive circuit that controls the displacement drive of the objective lens. Is displaced in the focus direction, which is the direction perpendicular to the recording surface of the disc. Further, the objective lens is driven to be displaced in the tracking direction, which is the radial direction of the disk, so that the focused laser beam follows the track formed on the recording surface of the disk. For supplying current from the drive circuit, wiring formed on the flexible printed circuit board is used.

  The drive source of the actuator has a magnetic circuit including a coil and a magnet, and the wiring formed on the flexible printed board is connected to the coil of the magnetic circuit. For example, when replacing a disk, when a charged operator's hand touches the actuator, static electricity may be discharged to the drive source. If an abnormal current resulting from electrostatic discharge flows through the coil of the drive source to the wiring connected to the drive circuit, the abnormal current may flow through the drive circuit and the drive circuit may be destroyed. In addition, the optical pickup device may malfunction.

  As a conventional technique for solving such a problem, a base portion made of a conductive material is connected and held to a housing made of a conductive material using a metal part such as a screw, and the housing and the actuator are interposed via the metal part. There is an optical pickup device that is electrically connected. When the actuator is electrically connected to the housing, even if static electricity is discharged to the actuator, an abnormal current flows from the base part to the housing, and the abnormal current is generated in the wiring connecting the magnetic circuit and the drive circuit. It can be prevented from flowing. As described above, the optical pickup device is configured to have high resistance to static electricity and prevent malfunction of the optical pickup device and destruction of the drive circuit and the like.

  FIG. 5 is a front view of the optical pickup device 51 in which the actuator and the housing 52 are electrically connected using a conductive adhesive. In the optical pickup device 51, for the purpose of electrically connecting the base portion 53 and the housing 52, an epoxy adhesive (hereinafter sometimes referred to as “conductive adhesive”) 54 containing metal powder is used as a base. The space between the portion 53 and the peripheral wall of the housing 52 in the holding portion 55 is filled and cured.

JP 2003-331447 A

  When the actuator is held in the housing, the actuator is positioned in the holding portion in order to reduce the optical aberration of the objective lens. Specifically, the positioning is performed by adjusting the tilt angle of the disc and the actuator and by adjusting the position of the center of the objective lens with the optical axis. In the configuration in which the actuator is held in the housing using the metal part, the base portion and the housing are connected using the metal part, so that the position adjustment for aligning the center of the objective lens with the optical axis cannot be performed. Therefore, the optical axis and the center of the objective lens are deviated to increase the optical aberration, so that there is a problem that the reading accuracy of the disk is lowered.

  In the optical pickup device 51 shown in FIG. 5, after adjusting the tilt angle and adjusting the position, the adhesive 56 is cured to position the actuator, and the holding portion 55 holds the actuator. As described above, the optical pickup device 51 can be positioned so that the tilt angle and position of the actuator can be adjusted.

  In the conductive adhesive 54 of the optical pickup device 51, the metal powder and the adhesive are easily separated, and the housing 52 and the base portion 53 may not be electrically connected. Therefore, after the conductive adhesive 54 is cured, it is necessary to confirm whether or not the housing 52 and the base portion 53 are electrically connected, and the number of operations increases in the production process. In addition, there is a problem that management work for managing the conductive adhesive 56 so as not to separate is difficult.

  An object of the present invention is to provide an optical pickup device that has high disk reading accuracy and high resistance to static electricity and can be easily manufactured.

The present invention includes a lens driving means in which a drive source for displacing and driving an objective lens by supplying current is mounted on a base,
A housing having a holding portion for holding the lens driving means;
After the lens driving means is positioned is a position adjustment and tilt adjustment for the holding portion, and the bonding member of the lens driving unit Ru is held by the holding portion,
A flexible printed circuit board possess the supply lines a plurality of supplying a current to the driving source, and a connection wiring for electrically connecting the base and the housing to permit displacement and inclination displacement of the lens driving means for the holding portion An optical pickup device comprising a flexible wiring means.

  According to the present invention, since the base and the housing are electrically connected by the connection wiring, even if static electricity is discharged to the lens driving means, an abnormal current does not flow in the supply wiring. An abnormal current can be passed through the housing.

The wiring means is a flexible printed circuit board to have a flexibility, so allowing the displacement and inclination displacement of the lens driving means for the holding portion, it is possible to position the lens driving means. Bonding member Runode the lens driving means is held in the holder after the lens drive means is positioned, in a state where the lens driving means is inclination adjustment and position adjustment, is Rukoto to hold the lens driving means in the holding portion it can.

  Furthermore, since the connection wiring is used, there is no need to perform a confirmation operation for confirming whether or not the base and the housing are electrically connected. Further, since the connection wiring and the supply wiring are formed in the wiring means, the supply wiring and the connection wiring can be connected to the lens driving means at a time.

Further , the base and the housing are electrically connected by using connection wiring formed on the flexible printed board including the supply wiring. Therefore, the base and the housing can be reliably electrically connected. Further, it is not necessary to add new parts for electrical connection between the base and the housing.

The present invention is characterized in that the connection wiring is formed between two adjacent supply wirings.
According to the present invention, since the connection wiring is formed between two adjacent supply wirings, electrostatic coupling between the two supply wirings can be suppressed.
In the present invention, the connection wiring is disposed between two supply wirings that form a part of the circuit for driving the objective lens in the focus direction, and a part of the circuit for driving the objective lens in the tracking direction is provided. It is characterized by being arranged between two supply wires formed.
According to the present invention, electrostatic coupling between the two supply wirings can be suppressed, so that crosstalk between the supply wirings can be prevented. Therefore, malfunction of the lens driving means can be reduced.

In the present invention, the lens driving means has a lens driving means side fixture made of a conductive material that is mechanically locked to the base and mechanically fixes the flexible printed circuit board to the base.
The connection wiring is characterized in that the terminal portion is in contact with the lens driving means side fixture.

  According to the present invention, since the terminal portion is brought into contact with the lens driving means side fixing tool using the lens driving means side fixing tool made of a conductive material for fixing the flexible printed circuit board to the base, the terminal portion is used as the base. New parts and work to connect can be omitted.

In the present invention, the housing has a housing-side fixture made of a conductive material that is mechanically locked to the housing and fixes the flexible printed circuit board to the housing.
The connection wiring is characterized in that the terminal portion is in contact with at least one of the housing and the housing-side fixture by the housing-side fixture.

  According to the present invention, the terminal part is brought into contact with at least one of the housing and the housing side fixing tool by using the housing side fixing tool made of a conductive material for fixing the flexible printed circuit board. New parts and work for connecting to either one of the housing fixtures can be omitted.

  The present invention is characterized in that the housing-side fixture has a projecting portion projecting toward the housing, and the projecting portion and the housing sandwich the portion of the printed circuit board where the terminal portion of the connection wiring is formed. .

  According to the present invention, since the housing-side fixture has the protruding portion, the terminal portion is surely arranged at least on the housing or the housing side as compared with the case where the terminal portion is sandwiched between flat surfaces. It can be brought into contact with either one of the fixtures. Therefore, it is possible to reliably increase the resistance of the optical pickup device to static electricity.

According to the present invention, even when static electricity is discharged to the lens driving means, the abnormal current can flow through the housing so that the abnormal current does not flow through the supply wiring, and the inclination angle adjustment of the lens driving means and Positioning can be performed after position adjustment. Therefore, the reading accuracy of the optical pickup device and the resistance to static electricity can be increased.

  In addition, it is not necessary to check whether the base and the housing are electrically connected, and both the connection wiring and the supply wiring are formed in the wiring means, so each wiring is connected at once. can do. Therefore, work in the manufacturing process of the optical pickup device is facilitated. Thus, the optical pickup device can be easily manufactured, and the reading accuracy of the disk and the resistance against static electricity can be increased.

In addition , the base and the housing can be reliably electrically connected, and it is not necessary to add new parts for the electrical connection between the base and the housing. Therefore, it is possible to increase resistance to static electricity while suppressing an increase in manufacturing cost of the optical pickup device.

According to the present invention, since electrostatic coupling between two adjacent supply lines can be suppressed, crosstalk between supply lines can be prevented. Therefore, malfunction of the lens driving means can be reduced.
According to the present invention, electrostatic coupling between the two supply wirings can be suppressed, so that crosstalk between the supply wirings can be prevented. Therefore, malfunction of the lens driving means can be reduced.

  According to the present invention, new parts and work for connecting the terminal portion to the base can be omitted. Therefore, since the increase in the number of parts of the optical pickup device and the number of operations in the production process can be suppressed, the resistance to static electricity can be increased while suppressing the increase in the manufacturing cost of the optical pickup device.

  According to the present invention, new parts and work for connecting the terminal portion to at least one of the housing and the housing fixture can be omitted. Therefore, since the increase in the number of parts of the optical pickup device and the number of operations in the production process can be suppressed, the resistance to static electricity can be increased while suppressing the increase in the manufacturing cost of the optical pickup device.

  According to the present invention, the terminal portion can be reliably brought into contact with at least one of the housing and the housing-side fixture. Therefore, it is possible to reliably increase the resistance of the optical pickup device to static electricity.

  FIG. 1 is a cross-sectional view in the thickness direction of an optical pickup device 1 according to an embodiment of the present invention. FIG. 2 is a diagram showing the optical pickup device 1 of FIG. 1 as viewed from below. FIG. 1 is a view showing the cross section of FIG. 2 as viewed from the left side. The optical pickup device 1 is mounted on, for example, a disk drive. The optical pickup device 1 includes an objective lens 2, lens driving means, a housing 3, a joining member, and wiring means. The objective lens 2 condenses the laser light emitted from the laser diode and irradiates the information recording surface of an information recording medium such as an optical disk or a magneto-optical disk.

  In the present embodiment, for example, a biaxial actuator (hereinafter sometimes referred to as “actuator”) 40 is used as the lens driving means. The lens driving means may be a shaft-type actuator or a mold hinge type actuator. The actuator 40 of the present embodiment is, for example, a 4-wire type actuator.

  The actuator 40 includes a drive source 41 and a base 42 on which the drive source 41 is mounted. The base 42 is made of a conductive material. In the present embodiment, the base 42 is an iron plate member, and includes a base portion 4 and a substrate fixing portion 5 formed by, for example, pressing. The substrate fixing part 5 rises approximately 90 degrees with respect to the base part 4. A screw hole 47 that penetrates the substrate fixing portion 5 in the thickness direction is formed in the substrate fixing portion 5.

  In the present embodiment, for example, a buffer material holder 8 is placed on the base portion 4. The buffer material holder 8 is placed on the base portion 4 in contact with the surface portion 5 a of the substrate fixing portion 5. The buffer material holder 8 holds a gel-like buffer material.

  The flexible printed circuit board 9 which is an example of the wiring means is fixed to the back surface portion 5b of the substrate fixing portion 5 opposite to the front surface portion 5a with which the buffer material holder 8 is in contact with, for example, a lens driving means side fixing tool made of a conductive material. The part 9a is fixed. In the present embodiment, for example, a conductive screw member 11 is used as the lens driving means side fixture. The fixing part 9a of the flexible printed circuit board 9 is fixed by, for example, forming a fixing hole 48 penetrating the flexible printed circuit board 9 in the thickness direction in the fixing part 9a and passing the screw member 11 made of a conductive material through the fixing hole 48. The screw member 11 is screwed into the screw hole 47 of the substrate fixing portion 5, and the fixing portion 9 a of the portion where the fixing hole 47 is formed by the head portion 11 a of the screw member 11 and the back surface portion 5 b of the substrate fixing portion 5. This is done by pinching. At this time, you may adhere | attach the fixing | fixed part 9a and the board | substrate fixing | fixed part 5 of the flexible printed circuit board 9 further using an adhesive agent.

  Moreover, the flexible printed circuit board 9 is adhered to the surface portion 4a of the base portion 4 opposite to the surface on which the cushioning material holder 8 is placed by an adhesive or the like at the attaching portion 9b of the flexible printed circuit board 9. The flexible printed circuit board 9 is a thin flexible wiring board having a structure in which, for example, a copper foil forming a wiring is sandwiched and bonded by a film material using a polymer material such as polyimide. The flexible printed circuit board 9 of the present embodiment includes supply wirings 32 to 35 that supply current to the drive source 41 and connection wiring 31 that electrically connects the base 42 and the housing 3.

  The drive source 41 includes, for example, a yoke 6, a bobbin 12, a permanent magnet 18, a focus coil 17, and a tracking coil 16. The yoke 6 has a U-shaped cross section, and is formed by making a predetermined cut in the base portion 4 and bending the one end portion 6a and the other end portion 6b in the direction in which the substrate fixing portion 5 rises. The bobbin 12 is formed, for example, by injection molding a resin. The bobbin 12 is formed with a first opening 13, a second opening 14, and a third opening 15. The objective lens 2 is held in the first opening 13 of the bobbin 12. One end 6 a of the U-shaped yoke 6 is formed in the second opening 14 at the center opening of the bobbin 12. A permanent magnet 18 is bonded to the surface on the third opening 15 side of the one end 6 a of the U-shaped yoke 6 extending to the second opening 14.

  A tracking coil 16 is provided between the second opening 14 and the third opening 15. The third opening 15 is provided with a focus coil 17 wound in a cylindrical shape that opens in the thickness direction of the bobbin 12. The other end portion 6 b of the yoke 6 is provided so as to be inserted into the focus coil 17 provided in the third opening 15. A permanent magnet 18 is bonded to the surface of the other end 6b of the yoke 6 on the second opening 14 side. Further, a metal rectangular top plate 7 is provided so as to be supported by the one end 6 a and the other end 6 b of the U-shaped yoke 6.

  A relay board 25 is provided on both side surfaces of the bobbin 12 between the second opening 14 and the third opening 15, and a relay terminal (not shown) is provided on the relay board 25. Copper wires related to the winding start and end portions of the focus coil 17 and the tracking coil 16 are connected to the relay terminal. Between the relay terminals on both side surfaces of the bobbin 12 and the substrate fixing portion 5, linear first suspension wires 19 and second suspension wires 20 having conductivity and elastically supporting the bobbin 12 are provided.

  The first suspension wire 19 and the second suspension wire 20 are provided in pairs on both side surfaces of the bobbin 12 through a gel-like buffer material held by the buffer material holder 8. One end of each of the pair of first suspension wires 19 is soldered to a relay terminal connected to a winding start portion and a termination portion of the focus coil 17, and is electrically and mechanically connected.

  Also, each one end of the pair of second suspension wires 20 is soldered to a relay terminal connected to the winding start portion and the end portion of the tracking coil 16, and is electrically and mechanically connected. The other end portion 19 a of the first suspension wire 19 and the other end portion 20 a of the second suspension wire 20 pass through through holes formed in the substrate fixing portion 5, and supply wirings formed on the fixing portion 9 a of the flexible printed circuit board 9. It connects with the terminal part of 32-35 by soldering.

  Each of the supply wirings 32 to 35 is connected to a drive circuit (not shown) that supplies current to the focus coil 17 and the tracking coil 16. In the present embodiment, the first supply wiring 32 and the second supply wiring 33 that supply current to the focus coil 17 are formed on the flexible printed circuit board 9. Further, a third supply wiring 34 and a fourth supply wiring 35 which are supply wirings for supplying a current to the tracking coil 16 are formed.

  The drive circuit controls displacement driving of the objective lens. By supplying current from the drive circuit to the focus coil 17 and the tracking coil 16 through the supply wires 32 to 35, the bobbin 12 is driven in the axial direction of the focus direction and the tracking direction. When the bobbin 12 is driven, the objective lens 2 held by the bobbin 12 is displaced so that the focused laser beam is focused on the information recording surface of the optical disk and follows the track formed on the information recording surface. Driven.

  In the present embodiment, housing 3 is made of, for example, a conductive material, and is formed of, for example, an iron member. In the housing 3, a holding portion 10 is formed by penetrating the housing 3 in the thickness direction in a rectangular shape. A guide hole 24 is formed in the housing 3. A female screw is formed on the inner wall of the housing 3 in the guide hole 24. A shaft on which a male screw is formed is screwed into the guide hole 24, and the optical pickup device 1 is guided to the shaft by a driving unit (not shown) and moves in the extending direction of the shaft. As a result, the optical pickup device 1 is driven in the tracking direction which is the radial direction of the disk.

  A cylindrical convex portion 21 is formed on the surface portion 43 of the housing 3 facing the optical disk. Further, the housing-side fixture 22 is locked to the housing 3 using a conductive material on the surface portion 43 of the housing 3 where the convex portion 21 is formed. In the present embodiment, the housing-side fixture 22 is assembled to the surface portion 43 of the housing 3 with a metal screw member or the like. The housing-side fixture 22 of the present embodiment is a metal plate member made of a conductive material, for example. In addition, a protruding portion 23 that protrudes from the flat portion 44 of the housing side fixture 22 toward the surface portion 43 of the housing 3 is formed at a position corresponding to the convex portion 21 of the housing side fixture 22. In addition, a first positioning hole 37 that penetrates the housing-side fixture 22 in the thickness direction is formed inside the protrusion 23. The housing-side fixture 22 presses the flexible printed circuit board 9 and regulates the thickness of the flexible printed circuit board 9 and protects the flexible printed circuit board 9 from external forces and external electrical disturbances. Further, it is assembled to the housing 3 for the purpose of reducing radiation from the flexible printed circuit board 9.

  Between the housing 3 and the housing-side fixture 22, a locking portion 9c of the flexible printed circuit board 9 is provided. Further, a second positioning hole 38 that penetrates the flexible printed circuit board 9 in the thickness direction is formed in the locking portion 9c. The convex portion 21 is inserted into the second positioning hole 38. Further, the convex portion 21 is inserted into the first positioning hole 37 formed in the housing side fixture 22. The locking portion 9c of the flexible printed circuit board 9 is elastically held between the bottom surface portion 46 of the protruding portion 23 of the housing-side fixture 22 and the surface portion 43 of the housing 3.

The joining member only needs to be a member that can position the actuator 40 on the holding unit 10 so that the position and inclination of the actuator 40 can be adjusted. In the present embodiment, for example, a non-conductive adhesive 45 is used.
The actuator 40 is positioned and held by the holding part 10 by curing the adhesive 45 filled between the peripheral wall of the holding part 10 and the base part 4 of the actuator 40 after the position adjustment and the inclination adjustment. Is done.

  Specifically, the tilt angle adjustment of the actuator 40 is performed by adjusting the tilt angle between the disc and the objective lens 2 in order to reduce the aberration of the laser beam condensed by the objective lens 2 on the disc recording surface. The position of the actuator 40 is adjusted by moving the actuator 40 in a plane perpendicular to the thickness direction of the housing 3 so that the optical axis of the laser light emitted from the laser diode passes through the center of the objective lens 2. 40 position adjustment is performed. In this way, the tilt angle adjustment and the position adjustment are performed to adjust the posture of the actuator 40 at the holding portion 10 of the housing 3, the actuator 40 is positioned, and the holding portion 10 is held using the adhesive 45.

  The member that electrically connects the housing 3 and the base 42 is made of a conductive material, and the base 42 and the housing 3 are connected to each other so that the position adjustment and the inclination angle adjustment of the actuator 40 can be permitted in the holding portion 10 of the housing 3. Any member may be used as long as it is electrically connected. For example, the connection wiring 31 is used for connection. Connection wiring 31 of the present embodiment is formed on flexible printed circuit board 9, for example. In the present embodiment, the base 42 and the housing 3 are electrically connected by connecting the board fixing portion 5 and the housing side fixture 22 using the connection wiring 31 formed on the flexible printed board 9. To do.

  FIG. 3 is a front view of the fixing portion 9 a of the flexible printed circuit board 9. The connection terminal portion 26 and the first terminal portion 27 to the fourth terminal portion 30 are formed on the fixing portion 9a of the flexible printed circuit board 9 of the present embodiment. The connection terminal part 26 is formed in the approximate center of the rectangular fixing part 9a, for example. Further, the connection terminal portion 26 is formed in a circular shape, for example. A fixing hole 48 penetrating the flexible printed circuit board 9 is formed inside the connection terminal portion 26 of the flexible printed circuit board 9. The fixing hole 48 formed in the connection terminal portion 26 and the screw hole 47 formed in the substrate fixing portion 5 are aligned, and the screw member 11 and the screw hole 47 are screwed together. In the present embodiment, for example, the diameter of the screw hole 47 and the diameter of the fixing hole 48 are formed substantially the same. The connection terminal portion 26 is held between the back surface portion 5 b of the substrate fixing portion 5 and the head portion 11 a of the screw member 11, and the head portion 11 a of the screw member 11 is brought into contact with the connection terminal portion 26. As a result, the connection terminal portion 26 and the substrate fixing portion 5 are electrically connected via the screw member 11. From the connection terminal portion 26, a connection wiring 31 that passes through substantially the center of the longitudinal side of the fixing portion 9 a of the flexible printed circuit board 9 extends.

  The 1st terminal part 27 and the 2nd terminal part 28 are formed in the longitudinal direction (left-right direction in FIG. 3) both ends of the fixing | fixed part 9a. Moreover, the 3rd terminal part 29 and the 4th terminal part 30 are formed in the longitudinal direction both ends of the fixing | fixed part 9a. The first terminal portion 27, the second terminal portion 28, the third terminal portion 29, and the fourth terminal portion 30 are spaced from each other in the short side direction (vertical direction in FIG. 3) perpendicular to the longitudinal direction, and the fixing portion 9a. Formed. A through hole is formed in the first terminal portion 27 and the second terminal portion 28. Further, two through holes corresponding to the positions of the through holes formed in the first terminal portion 27 and the second terminal portion 28 are also formed in the substrate fixing portion 5. The other end portions 19 a of the pair of first suspension wires 19 are inserted through the through holes formed in the substrate fixing portion 5, the first terminal portion 27, and the second terminal portion 28. The two other end portions 19a of the pair of first suspension wires 19 are soldered and fixed to the first terminal portion 27 and the second terminal portion 28, respectively.

  The third terminal portion 29 and the fourth terminal portion 30 are formed with through holes. Two through holes corresponding to the positions of the through holes formed in the third terminal portion 29 and the fourth terminal portion 30 are also formed in the substrate fixing portion 5. Two other end portions 20 a of the pair of second suspension wires 20 are inserted into the through holes formed in the substrate fixing portion 5, the third terminal portion 29, and the fourth terminal portion 30. Two other end portions 20a of the pair of second suspension wires 20 are soldered and fixed to the third terminal portion 29 and the fourth terminal portion 30, respectively.

  A first supply line 32 and a second supply line 33, which are supply lines that supply current to the focus coil 17, are connected to the first terminal part 27 and the second terminal part 28. Further, a third supply wiring 34 and a fourth supply wiring 35, which are supply wirings for supplying current to the tracking coil 16, are connected from the third terminal portion 29 and the fourth terminal portion 30. The third supply wiring 34 is formed at a position further away from the first supply wiring with respect to the connection wiring 31. The first supply wiring 32 and the second supply wiring 33 are formed in a distributed manner with the connection wiring 31 interposed therebetween. Further, the third supply wiring 34 and the fourth supply wiring 35 are formed in a distributed manner with the connection wiring 31 interposed therebetween. In the present embodiment, the first supply wiring 32 and the third supply wiring 34, and the second supply wiring 33 and the fourth supply wiring 35 are formed on the flexible printed circuit board 9 symmetrically with respect to the connection wiring 31.

  FIG. 4 is an enlarged cross-sectional view of the surface portion 43 of the housing 3. In the present embodiment, the flexible printed circuit board 9 extends between the housing side fixture 22 and the housing 3, and the tip is inserted into the second positioning hole 38 formed in the locking portion 9 c of the flexible printed circuit board 9. The convex part 21 formed in the hemisphere is inserted. In addition, a circular housing side terminal portion 36 that is a terminal portion of the connection wiring 31 is formed in a portion where the second positioning hole 38 of the locking portion 9 c of the flexible printed circuit board 9 is formed.

  By inserting the convex portion 21 into the first positioning hole 37 formed in the housing side fixture 22 of the housing side fixture 22, the portion of the flexible printed circuit board 9 where the housing side terminal portion 36 is formed is fixed to the housing side. The bottom portion 46 of the projecting portion 23 of the tool 22 and the surface portion 43 of the housing 3 are sandwiched. Further, the housing side terminal portion 36 and the bottom surface portion 46 of the protruding portion 23 are brought into contact with each other. In the present embodiment, the diameter d1 of the housing-side terminal portion 36 formed in a circular shape is formed larger than the diameter d2 of the bottom surface portion 46 of the protruding portion 23 protruding in a circular shape of the housing-side fixture 22. In the present embodiment, for example, the first positioning hole 37 and the second positioning hole 38 are formed to have substantially the same diameter.

  In the present embodiment, the housing side terminal portion 36 is brought into contact with the bottom surface portion 46 of the protruding portion 23 of the housing side fixture 22 to electrically connect the housing 3 and the connection wiring 31. Further, the connection wiring 31 and the board fixing part 5 are electrically connected via the screw member 11 and the connection terminal part 26. Thus, in this embodiment, the board | substrate fixing | fixed part 5 of the base 42 and the housing 3 are electrically connected.

  According to the optical pickup device 1 of the present embodiment, since the connection wiring 31 that electrically connects the base 42 and the housing 3 is provided, each supply is possible even when static electricity is discharged to the actuator 40. An abnormal current can be supplied to the housing 3 through the connection wiring 31 so that the abnormal current does not flow to the drive circuit or the like through the wirings 32 to 35. Accordingly, the resistance of the optical pickup device 1 to static electricity can be increased.

  Further, since the flexible printed circuit board 9 has flexibility and the actuator 40 is positioned and held by the adhesive 45 in the holding unit 10, the actuator 40 can be positioned and adjusted in inclination. Can do. Therefore, since the actuator 40 can be positioned with high accuracy, the disk reading accuracy of the optical pickup device 1 can be increased.

  Furthermore, since the connection wiring 31 is used, it is not necessary to perform a confirmation operation for confirming whether or not the base 42 and the housing 3 are electrically connected. Further, since the connection wiring 31 and the supply wirings 32 to 35 are formed on the flexible printed circuit board 9, the connection terminal portion 26 of the connection wiring 31 is connected to the substrate fixing portion 5 in the substrate fixing portion 5 of the base 42. The terminal portions 27 to 30 of the supply wires 32 to 35 can be connected to the suspension wires 19 to 20. In this way, the disk reading accuracy of the optical pickup device 1 can be increased and the resistance to static electricity can be increased at the same time with an easy operation.

  According to the optical pickup device 1 of the present embodiment, the base 42 and the housing 3 are electrically connected using the connection wiring 31 formed on the flexible printed board 9 including the supply wiring. Therefore, the base 42 and the housing 3 can be reliably electrically connected. Further, since the connection wiring 31 is formed on the flexible printed circuit board 9 including the supply wirings 32 to 35, it is not necessary to add new parts for electrical connection between the base 42 and the housing 3, and the optical wiring Resistance to static electricity can be increased while suppressing an increase in manufacturing cost of the pickup device 1.

According to the optical pickup device 1 of the present embodiment, the first supply wiring 32, the second supply wiring 33, and the third supply wiring 34 that are formed on the flexible printed circuit board 9 and are necessary for driving the objective lens 2. The connection wiring 31 is formed between the fourth supply wiring 35 and the fourth supply wiring 35. In this way, for example, electrostatic coupling between supply wires forming a pair for driving the objective lens in the tracking direction and the focus direction can be suppressed, and crosstalk between the pair of supply wires can be prevented. Therefore, the malfunction of the actuator 40 can be reduced. According to the optical pickup device 1 of the present embodiment, the connection terminal portion 26 is connected to the screw member 11 by using the screw member 11 made of a conductive material that fixes the flexible printed circuit board 9. The connection wiring 31 is electrically connected to the substrate fixing portion 5 by contacting the head 11a. Therefore, new parts for connecting the connection terminal portion 26 to the base and work such as soldering can be omitted. Thus, since the increase in the number of parts of the optical pickup device 1 and the number of operations in the production process can be suppressed, the resistance to static electricity can be increased while suppressing the increase in the manufacturing cost of the optical pickup device 1.

  According to the optical pickup device 1 of the present embodiment, the housing-side terminal portion 36 is brought into contact with the housing-side fixture 22 using the housing-side fixture 22 that fixes the flexible printed circuit board 9. Since the housing-side fixture 22 is made of a conductive material and mechanically locked to the housing 3, the base 42 and the housing 3 can be electrically connected using the connection wiring 31. Also, new parts and work for connecting the housing side terminal portion 36 to the main body can be omitted. Therefore, since the increase in the number of parts of the optical pickup device 1 and the number of operations in the production process can be suppressed, the resistance to static electricity can be increased while suppressing the increase in the manufacturing cost of the optical pickup device 1.

  According to the optical pickup device 1 of the present embodiment, since the housing-side fixture 22 has the protruding portion 23, compared to the case where the housing-side terminal portion 36 is sandwiched between flat surfaces, The housing-side terminal portion 36 can be reliably brought into contact with the housing-side fixture 22. Therefore, the resistance of the optical pickup device 1 to static electricity can be reliably increased.

  According to the optical pickup device 1 of the present embodiment, the connection wiring 31 is used for electrical connection between the base 42 and the housing 3. Therefore, when a conductive adhesive is used for electrical connection between the base 42 and the housing 3, the heating operation or the natural curing operation necessary to cure the conductive adhesive is produced in the optical pickup device 1. There is no need to do it in the process. When the conductive adhesive is cured by a heating operation, a thermal load is applied to the optical pickup device 1 and the yield of the pickup device 1 is reduced. Furthermore, when the conductive adhesive is cured by a natural curing operation, the operation time in the production process of the optical pickup device 1 becomes long. Therefore, an increase in the production cost of the optical pickup device 1 can be suppressed as compared with a configuration in which the base 42 and the housing 3 are electrically connected using a conductive adhesive.

  In the optical pickup device in which the base 42 and the housing 3 are electrically connected using a conductive adhesive, the conductive adhesive contains metal powder. Therefore, when performing a repair work for repairing the optical pickup device, it is necessary to prevent adhesion of the adhesive powder of the hardened conductive adhesive to the electronic component, which makes the repair work difficult. In the optical pickup device 1 of the present embodiment, since a conductive adhesive is not used, repair work can be easily performed.

  As another embodiment of the present invention, a portion where the housing side terminal portion 36 is formed is sandwiched between the bottom surface portion 46 of the projecting portion 23 of the housing side fixture 22 and the surface portion 43 of the housing 3, and the connection wiring The housing side terminal portion 36 of 31 is brought into contact with the housing 3. As described above, the optical pickup device 1 described above may be configured such that the housing side terminal portion 36 of the connection wiring 31 is brought into contact with the surface portion 43 of the housing 3 to electrically connect the housing 3 and the base 42. Has the same effect.

It is sectional drawing of the thickness direction of the optical pick-up apparatus 1 of one Embodiment of this invention. It is a figure which shows the optical pick-up apparatus 1 of FIG. 1 seeing from the downward direction. 2 is a front view of a fixing portion 9a of a flexible printed board 9. FIG. 4 is an enlarged cross-sectional view of a surface portion 43 of the housing 3. FIG. It is a front view of the optical pick-up apparatus 51 which electrically connected the actuator and the housing 52 using the adhesive agent which has electroconductivity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus 2 Objective lens 3 Housing 4 Base part 5 Board | substrate fixing | fixed part 9 Flexible printed circuit board 11 Screw member 21 Convex part 22 Housing side fixture 23 Protrusion part 31 Connection wiring 40 Actuator 41 Drive source 42 Base

Claims (6)

A lens driving means in which a driving source for displacing and driving the objective lens by supplying current is mounted on the base;
A housing having a holding portion for holding the lens driving means;
After the lens driving means is positioned is a position adjustment and tilt adjustment for the holding portion, and the bonding member of the lens driving unit Ru is held by the holding portion,
A flexible printed circuit board possess the supply lines a plurality of supplying a current to the driving source, and a connection wiring for electrically connecting the base and the housing to permit displacement and inclination displacement of the lens driving means for the holding portion An optical pickup device comprising a flexible wiring means. The optical pickup device according to claim 1 , wherein the connection wiring is formed between two adjacent supply wirings. The connection wiring is arranged between two supply wirings that form part of a circuit for driving the objective lens in the focusing direction, and two supplies that form part of the circuit for driving the objective lens in the tracking direction The optical pickup device according to claim 2, wherein the optical pickup device is disposed between the wirings. The lens driving means has a lens driving means side fixture made of a conductive material that is mechanically locked to the base and mechanically fixes the flexible printed circuit board to the base.
4. The optical pickup device according to claim 2, wherein the connection wiring has a terminal portion in contact with the lens driving means side fixture. The housing has a housing-side fixture made of a conductive material that is mechanically locked to the housing and fixes the flexible printed circuit board to the housing.
The connection wiring, the terminal part housing-side fastener, the optical pickup according to any one of claims 2-4, characterized in that is in contact on one of at least the housing or the housing-side fastener apparatus.   6. The housing-side fixture has a projecting portion projecting toward the housing, and the projecting portion and the housing sandwich a portion where a terminal portion of a connection wiring on the printed circuit board is formed. The optical pickup device described.