JP3415445B2 - Manufacturing method of actuator device for optical pickup - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for manufacturing an actuator device for an optical pickup in an apparatus for optically writing or reading information on an optical disk. An optical information recording / reproducing apparatus such as an optical disk player is provided with an optical pickup device for optically writing or reading information on an optical disk. The optical pickup device condenses a light beam generated by a light beam generating means such as a semiconductor laser on a recording surface of an optical disc as a condensed spot having a predetermined diameter by an objective lens to record a signal on the optical disc. Delete or detect signals from optical disc. The optical pickup device is provided with an actuator device for driving the objective lens in order to correct the positioning of the focused spot. [0003] A conventional optical pickup actuator device will be described with reference to FIGS. FIG. 4 is an external perspective view of a conventional optical pickup actuator device.
FIG. 5 is an exploded view of parts of the actuator device. FIG. 6 is an assembly diagram showing how to attach the objective lens support member and the coil of the actuator device. The actuator device includes an objective lens 10 for condensing a light beam with a predetermined diameter on a recording surface of an optical disk, an objective lens support member 1 for supporting the objective lens 10, a focusing of a condensed spot. Focus coil 2 for moving the objective lens 10 in the direction perpendicular to the recording surface of the optical disc (the direction of F in FIG. 4)
And a radial coil 3 for moving the objective lens 10 in the radial direction (the direction of R in FIG. 4) with respect to the recording surface of the optical disc in order to correct the position of the focused spot so as not to deviate from the track. The magnet includes a magnet 6 forming a magnetic circuit with the coil, and a yoke 9 which is a magnetic material for guiding magnetic flux of the magnet 6. The objective lens supporting member 1 is supported by a spring 5, and a relay board 4 is connected to the spring 5 as a relay.
Is used. The spring 5 is attached to a spacer 8, and the spacer 8, the magnet 6, and the yoke 9 are held by a base 7. A part of the focus coil 2 and the radial coil 3 are surrounded by the magnet 6, the yoke 9, and the base 7. As shown in FIG. 6A, an assembly of the focus coil 2 and the radial coil 3 is incorporated in the coil mounting portion of the objective lens supporting member 1. The assembling accuracy of the assembly of the focus coil 2 and the radial coil 3 incorporated in the coil mounting portion of the objective lens support member 1 depends on the center of gravity of the objective lens support member 1 to which the coil assembly is assembled and the coil assembly. High accuracy is required to increase the accuracy of the positional relationship between the two coils in the product and the point of action. Accordingly, the gap between the objective lens support member 1 and the assembly of the focus coil 2 and the radial coil 3 is made as small as possible. Specifically, the dimensional accuracy of the dimensions 1W and 1D of the coil mounting portion of the objective lens support member 1 and the outer dimensions 2W 'and 2D' of the focus coil 2 is strictly regulated, and as shown in FIG. After inserting the coil assembly into the coil mounting portion of the objective lens support member 1, FIG.
An adhesive is applied to the tapered portion C of the objective lens supporting member 1 provided for applying the adhesive as described above, and the adhesive is cured. [0007] In the conventional method of assembling the coil assembly to the coil mounting portion of the objective lens support member 1, it is necessary to increase the dimensional accuracy of each component. Further, since the coil is wound around the core portion of the winding jig, it is easy to manage the dimensional accuracy of the inner dimensions 2W and 2D, but it is difficult to manage the dimensional accuracy of the outer dimensions 2W 'and 2D'. In addition, since the winding of the coil and the molding of the objective lens support member 1 are separately performed, and then the coil is assembled to the objective lens support member 1, a reduction in work efficiency and a problem in management occur. I do. That is, the point of low efficiency in operation is that after the coil is formed by the coil winding jig, it is necessary to remove the coil from the coil winding jig and reinsert it into the objective lens support member 1. . The problem in management is that the coil and the objective lens support member 1 are wound between the time when the coil is wound and the time when the coil is inserted into the objective lens support member 1.
Need to be managed separately for its quantity, quality, delivery, etc. Further, since the coil is fixed to the objective lens support member 1 with an adhesive, the amount of the adhesive applied and the state of the application are determined by the fixing strength between the objective lens support member 1 and the coil. Influences. Further, since the variation in the applied amount of the adhesive causes the variation in the weight balance of the objective lens support member 1, the variation in the applied amount of the adhesive becomes an unstable factor in the dynamic characteristics of the actuator device. Magnet 6 and yoke 9 forming a magnetic circuit with the coil
Is a metal and is fixed to the base 7. However, since the coil is incorporated in the objective lens supporting member 1 serving as a movable portion, the contact with the fixed metal member as described above can occur, so that the coil covers the periphery of the wire forming the coil. Peeling of the insulating film occurs, and the coil is short-circuited. Further, if there is abrasion or impact on the wire of the coil, disconnection also occurs. SUMMARY OF THE INVENTION It is an object of the present invention to improve the efficiency of the manufacturing operation of an actuator device for an optical pickup and to enable good management of the manufactured actuator device. It is another object of the present invention to provide a method of manufacturing an actuator device for an optical pickup which can improve the positional accuracy between an objective lens supporting member and a coil. [0013] The present invention provides a disk-shaped recording medium.
To write or read information optically on the body
An objective lens for condensing the light beam, a magnet,
In combination with a stone, move the objective lens in the optical axis direction of the light beam.
Focus coil that forms a magnetic circuit to drive the lens
And the radius of the disc-shaped recording medium in combination with the magnet
Form a magnetic circuit to drive the objective lens in the direction
A radial coil, the objective lens and the focus core
Support member for integrally supporting the coil and the radial coil
And the support member is also driven by the objective lens by the driving.
Lens, the focus coil, and the radial coil.
In an optical pickup actuator device that moves
Winding of the focus coil and the radial coil
Molding the support member with a core or pin for performing
The focus coil and the radius
Of the support member at the same time as molding of the coil.
The focus coil and the radial coil
And the support member is integrally molded. [0014] [0015] [0016] [0017] With the manufacturing method of the actuator device of the optical pickup having such a configuration, by providing the coil winding functions in a mold of the support member, to said supporting member Since the coil can be easily positioned, work efficiency can be improved. FIG. 1 shows an objective lens supporting member mounted on an actuator device of an optical pickup according to a first embodiment of the present invention. The objective lens support member 1 includes a focus coil 2 for moving the objective lens 10 (see FIG. 4) in a direction perpendicular to the recording surface of the optical disc in order to perform focusing of the condensed spot, The objective lens 10 is integrally formed with the radial coil 3 for moving the objective lens 10 in the radial direction with respect to the recording surface of the optical disk in order to correct the objective lens 10 so that the objective lens 10 does not come off. The focus coil 2 and the radial coil 3 are formed by winding a wire having a conductive wire covered with an insulating material by a coil winding jig. An adhesive is applied on the insulating film of the wire so that the two coils are not distorted after being taken out of the tool. When manufacturing the actuator device of the optical pickup, the assembly composed of the focus coil 2 and the radial coil 3 created in this way is incorporated into a mold for molding the objective lens support member 1, and the objective lens support An integral molding with the member 1 is performed. The objective lens supporting member 1 integrally formed with the coil shown in FIG. 1 is formed by the above-described manufacturing method. FIG. 2 shows an objective lens supporting member mounted on an actuator device of an optical pickup according to a second embodiment of the present invention. The objective lens support member 1
Similarly to the first embodiment, the focus coil 2 for moving the objective lens 10 in the direction perpendicular to the recording surface of the optical disc in order to perform focusing of the focused spot.
And a radial coil 3 for moving the objective lens 10 in the radial direction with respect to the recording surface of the optical disc in order to correct the position of the condensed spot so as not to deviate from the track.
And are integrally molded. As shown in FIG. 3, when the objective lens 10 is moved in a direction perpendicular to the recording surface of the optical disk, a magnet 6 is used in addition to a force F applied to the center of gravity G of the objective lens support member 1 by a magnetic circuit. Couple F ′ due to a leakage magnetic field B ′ other than the magnetic field B induced in the magnetic circuit of the yoke 9 and the base 7, in the focus coil 2 crossing a part of the magnetic path of the magnetic circuit. It covers part A outside the magnetic circuit. Since the couple F 'gives a rotational movement to the objective lens supporting member 1, the focus coil 2 is moved so that the A side of the focus coil 2 is kept away from the magnetic circuit in order to reduce the couple F'. Inner diameter 2
The focus coil 2 is created so that D becomes large. Further, the objective lens support member 1 is provided so that the focus coil 2 and the radial coil 3 do not come into direct contact with metal members such as the magnet 6 and the yoke 9. It is molded so as to cover the coil 3. Further, the focus coil 2 and the radial coil 3 are formed by winding a wire having a conductive wire covered with an insulating material by a coil winding jig as in the first embodiment. is there. However, these coils are formed by using a part of a mold for molding the objective lens supporting member as a core or a pin. for that reason,
No adhesive is required to maintain the shape of the coil. The hole H in FIG. 2 is a mark of a mold pin for winding the coil. As described above, the objective lens supporting member is integrally formed with the coil by using the mold around which the coil is wound and formed. The actuator of the optical pickup according to the present invention
According to the method of manufacturing the focus device, the focus coil and the
Core or pin for winding the radial coil
Using the mold for molding the support portion provided
Before forming the coil and the radial coil,
By forming the supporting member, the focus coil
And the radial coil and the support portion are integrally molded.
Therefore, the coil of the coil to the objective lens support member
Incorporation step and bonding step for fixing the coil
Can be omitted. [0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural perspective view of an objective lens supporting member mounted on an actuator device of an optical pickup used in a first embodiment. FIG. 2 is a structural perspective view of an objective lens supporting member mounted on an actuator device of an optical pickup used in a second embodiment. FIG. 3 is a cross-sectional view of the actuator device of the optical pickup used in the present invention as viewed from the side. FIG. 4 is a structural perspective view of a conventional optical pickup actuator device. FIG. 5 is an exploded view of parts of a conventional optical pickup actuator device. FIG. 6 is a diagram showing an assembly of an objective lens support member and a coil. [Description of Signs] 1 Objective lens support member 2 Focus coil 3 Radial coil 4 Relay board 5 Spring 6 Magnet 7 Base 8 Spacer 9 Yoke 10 Objective lens

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryuichi Awaya 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Hirofumi Ohno 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72) Inventor Noriaki Fujii 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-8-31007 (JP, A) JP-A-10-143889 (JP, A JP-A 8-203101 (JP, A) JP-A 3-273532 (JP, A) JP-A 8-339918 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 7/09-7/22

Claims (1)

(57) [Claims 1] An objective lens for condensing a light beam for optically writing or reading information on a disc-shaped recording medium, a magnet, and a combination of the magnet and the objective lens. A focus coil forming a magnetic circuit for driving the objective lens in the optical axis direction of the light beam; and a magnetic circuit forming a magnetic circuit for driving the objective lens in the radial direction of the disc-shaped recording medium in combination with the magnet. A radial coil, and a support member that integrally supports the objective lens, the focus coil, and the radial coil; and the support member also moves with the objective lens, the focus coil, and the radial coil by the driving. In the actuator device, a core or a core for winding the focus coil and the radial coil The focus coil, the radial coil, and the support member are formed by simultaneously molding the focus coil and the radial coil using a mold for molding the support member provided with the support member. A method for manufacturing an actuator device for an optical pickup, comprising integrally molding with a member.