JP2000011411A - Optical pick-up device and method for manufacturing parts therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pick-up device that workability is improved as well as the number of parts is reduced, and that reduction in cost and improvement in quality are attained. SOLUTION: By extending a supporting member 6 supporting an object lens holding bobbin 2 through a fixed part 9a of a yoke base 9 holding a magnet 8, an edge part 6a of this extended supporting material 6 is directly connected with a circuit board 12 for packaging a hologram laser element 11 thereon. In such a manner, it is possible to decrease the number of parts and assembly man-hour, and achieve a low-cost optical pick-up device stabilized in quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device used for an optical recording / reproducing device such as a compact disk player.

[0002]

2. Description of the Related Art An optical pickup device used for an optical disk device for reproducing or recording a compact disk is
The track on which the signal is recorded must be traced accurately by following the surface deflection in the focus direction and the outer circumference deflection in the tracking direction of the compact disc. For this purpose, the objective lens is fixed and a bobbin around which the focus coil and tracking coil are wound, and the bobbin is supported so as to be movable in the focus direction and the tracking direction, and is electrically connected to the focus coil and the tracking coil at the same time. And an actuator unit including a support member. In addition, a driving current must be supplied from the circuit board to the coil to drive the actuator. For this purpose, the supporting member is connected to the relay circuit board, and further connected to the circuit board using a connecting material such as a lead wire. This optical pickup device is shown in FIGS.
It is configured as shown in FIG.

In FIGS. 10 and 11, reference numeral 1 denotes an objective lens, and 2 denotes a bobbin to which the objective lens 1 is fixed. A focus coil 3 and a tracking coil 4 are wound around the bobbin 2. The bobbin 2 is connected to the relay circuit board 30
Are supported movably in the focus direction and the tracking direction by four elastically deformable support members 6 fixed to the support member 6. The bobbin 2 is located near the fixing portion of the support member 6.
A damping member 7 is provided to attenuate the vibration of the
To the yoke base 9. Yoke base 9
A magnet 8 is fixed to the yoke base 9.
Are guide portions 10 so that they can be moved in the radial direction of the disk.
The objective lens 1 is held so that the angle of the objective lens 1 can be adjusted with respect to the base 10 provided with a and 10b. On the base 10, a straight tube portion 10d provided with a hollow portion 10c through which laser light passes is formed, and a circuit board 12 on which a hologram laser element 11 is mounted is fixed to the straight tube portion 10d by a spring 13.
By connecting the relay board 30 and the circuit board 12 so as to be electrically conductive by the connection member 31, the bobbin driving current supplied from the connector 15 can flow to the focus coil 3 and the tracking coil 4 via the support member 6. It is configured as follows.

In such a configuration, the bobbin 2 on which the objective lens 1 is fixed is moved in the focus direction and the tracking direction according to a drive current controlled by a servo circuit (not shown), so that eccentricity and surface runout are reduced. It is possible to accurately trace signal tracks on a disk having the disk.

[0005]

In recent years, there has been a demand for a further reduction in the cost and higher reliability of a compact disk reproducing apparatus. Among the compact disk reproducing apparatuses, this type of optical pickup apparatus has a particularly large cost weight. is occupying.

However, in the conventional optical pickup device, the support members 6 are soldered to the relay board 30 fixed to the yoke base 9 with screws 32, and the connection member 31 is further connected to the connection portion 30a of the relay board 30 and the circuit board 12. Since it is soldered to the connection portion 12a, there are problems that it takes much labor and time, the production cost is increased, the productivity is low, and the quality is unstable.

An object of the present invention is to solve the above-mentioned problems, and to improve the workability while reducing the number of parts, to reduce the cost and improve the quality, and to provide a method of manufacturing parts for the optical pickup apparatus. The purpose is to provide.

[0008]

To solve this problem, an optical pickup device according to the present invention comprises a hologram laser element, a circuit board on which the hologram laser element is mounted, an objective lens, and an objective lens. A bobbin wound with a focus coil and a tracking coil, a conductive and elastic supporting member electrically connected to the focus coil and the tracking coil and movably supporting the bobbin, and a driving member for driving the bobbin. A yoke base provided with a fixing portion for holding a magnet constituting a magnetic circuit and fixing and supporting the supporting member, and tilting the yoke with respect to an optical axis passing through the center of the objective lens around a center of the objective lens as a center of rotation. And a base for holding the hologram laser element on an optical axis passing through the center of the objective lens. The support member is extended through said yoke base of the fixed part, is characterized in that it has connected directly extending the end of the support member to the circuit board.

As a result, it is possible to provide an optical pickup device which can improve workability while reducing the number of parts and can reduce costs and improve quality.

[0010]

An optical pickup device according to the present invention is characterized in that a hologram laser element, a circuit board on which the hologram laser element is mounted, an objective lens, a focus coil holding the objective lens, and a tracking coil. A bobbin wound with a coil, a conductive and elastic support member electrically connected to the focus coil and the tracking coil and movably supporting the bobbin; and a magnetic circuit for driving the bobbin. A yoke base provided with a fixing portion for holding the magnet to be fixed and supporting the supporting member, and holding the yoke so as to be tiltable with respect to an optical axis passing through the center around the center of the objective lens as a rotation center. And a base for holding the hologram laser element on an optical axis passing through the center of the objective lens. Serial through the yoke base of the fixed part is extended, and is characterized in that it has connected directly extending the end of the support member to the circuit board.

According to the above configuration, the extended end of the support member is directly connected to the circuit board. Therefore, the support members are soldered to the relay board fixed to the yoke base, respectively, and the connection member is further relayed as in the conventional case. Compared to soldering to the connection part of the board and the connection part of the circuit board, the number of parts can be reduced because the relay board and the connection member are not used, and the connection member is soldered to the connection part of the relay board. Since it is not necessary to perform the above, the workability is improved, and the cost can be reduced and the quality can be improved.

According to a second aspect of the present invention, there is provided an optical pickup device comprising a hologram laser element, a circuit board on which the hologram laser element is mounted, an objective lens, and a focus coil and a tracking coil holding the objective lens. Holds a bobbin, a conductive and elastic support member electrically connected to the focus coil and the tracking coil and movably supporting the bobbin, and a magnet constituting a magnetic circuit for driving the bobbin. A yoke base provided with a fixing portion for fixing and supporting the supporting member, the yoke being held about a center of rotation of the objective lens as a rotation center and tiltable with respect to an optical axis passing through the center, and the hologram; A base for holding the laser element on an optical axis passing through the center of the objective lens; and The supporting member is extended through the fixing portion of the base, and a connector portion having an elastic hook portion is provided at an extended end of the supporting member, and the elastic hook portion of the connector portion is engaged with the circuit board. Are configured to be connectable to a circuit board.

According to the above configuration, the connector is provided at the extended end of the support member, and the end of the support member is connected to the circuit board by this connector. Since the supporting members are soldered to the relay board, and the connection members are further soldered to the connection portions of the relay board and the connection portions of the circuit board, the connection members and the relay board are not used. Since the number of components can be reduced, it is not necessary to solder the connection member to the connection part of the relay board, and the support member can be easily connected to the circuit board simply by engaging the elastic hook part of the connector part with the circuit board. Performance can be improved, and cost can be reduced and quality can be improved.

An optical pickup device according to a third aspect of the present invention is the optical pickup device according to the second aspect,
A plurality of support members are provided, and a plurality of connector portions are provided at least in two parts corresponding to the support members.

According to the above configuration, since the connector portion is divided and provided corresponding to the support member, the connection space occupied on the circuit board can be reduced, and the size of the optical pickup device can be reduced.

According to a fourth aspect of the present invention, there is provided an optical pickup device according to any one of the first to third aspects, wherein an insulating member for electrically insulating the surface is provided on the support member. It is a feature.

According to the above configuration, a short circuit between the support members that occurs when the support member is connected to the circuit board can be prevented by the insulating member, and the reliability is improved. An optical pickup device according to a fifth aspect of the present invention is the optical pickup device according to any one of the first to third aspects, wherein an insulating film for electrically insulating is provided on a surface of the support member. Things.

According to the above configuration, a short circuit between the support members, which occurs when the support member is connected to the circuit board, can be prevented by the insulating film, and the reliability is improved. According to a sixth aspect of the present invention, a yoke base for holding a magnet, a support member for supporting an object lens holding bobbin, and a connector portion for connecting the support member, each of which is used in an optical pickup device, are manufactured. In the method, a plurality of yoke base molding locations and connector molding locations are alternately formed at predetermined intervals in a molding die, and all the molding locations of the yoke base and the connector are formed. A long support member is arranged in the molding die so as to penetrate, a molding material is injected into the mold, and the yoke base and the connector portion connected by the support member are alternately and continuously formed, Thereafter, a predetermined position of the continuous supporting member is cut and separated to obtain a composite part in which the yoke base, the supporting member, and the connector are integrated.

According to this method, at the time of molding, a plurality of composite parts in which the yoke base, the support member, and the connector are integrated can be obtained at one time, and the number of assembling steps can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIGS. 1 and 2 show a first embodiment of the present invention.
1 is a perspective view showing a connection state, and FIG. 2 is a side view of the optical pickup device. The components having substantially the same functions as those in the related art are denoted by the same reference numerals.

1 and 2, reference numeral 1 denotes an objective lens for focusing a laser on a signal surface of a compact disc;
Reference numeral 2 denotes a bobbin to which the objective lens 1 is fixed. The bobbin 2 has a focus coil 3 and a tracking coil 4.
Is wound. Supporting member 6 having conductivity and elasticity
Is held in a cantilevered state by a fixing portion 9a provided on the yoke base 9 at one half thereof, and one end is fixed by soldering a protruding portion 2a provided on the bobbin 2, whereby the bobbin 2 is moved in the focus direction and tracking. It is movably supported in the direction. Here, the focus coil 3 and the tracking coil 4 and the support member 6 are connected via the protrusion 2a.
Are connected so as to be electrically conductive. Also,
The yoke base 9 is provided with a damping member 7 for attenuating the vibration of the bobbin 2 near a fixing portion 9a for fixing the support member 6, and a force in the focus direction acts on the focus coil 3 when the focus coil 3 is energized. A magnet 8 is fixed to the coil 4 at a position facing the bobbin 2 so that a force in the tracking direction acts on the coil 4 when energized.

Further, the yoke base 9 engages with a traverse guide (not shown) so that the disk can be moved in the radial direction. It is held adjustable. Further, a straight tube portion 10d provided with a hollow portion 10c through which laser light passes is formed on the base 10, and a circuit board 12 having a hologram laser element 11 mounted on the straight tube portion 10d is fixed by a spring 13. .

The support member 6 is fixed to a fixing portion 9a provided on the yoke base 9 and extends through the fixing portion 9a. The extended end 6a is
2 are directly connected by soldering or the like so that they can be electrically connected to each other. This allows the bobbin drive current supplied through the FFC (flexible wiring board) 16 attached to the connector 15 mounted on the circuit board 12 to flow to the focus coil 3 and the tracking coil 4 via each support member 6. It is composed.

The operation of the optical pickup device configured as described above will be described below. In such a configuration, the drive current controlled by the servo circuit (not shown) is supplied directly from the circuit board 12 via the support member 6 to the focus coil 3 and the tracking coil 4 held in the magnetic field generated by the magnet 8. The bobbin 2 to which the objective lens 1 is fixed is moved in the focusing direction and the tracking direction, thereby enabling accurate tracing of the signal track on the compact disc.

Further, according to the above configuration, the end 6b of the support member 6 is directly connected to the circuit board 12, so that the conventional structure (FIG.
0, see FIG. 11), the support members 6 are each soldered to the relay board 30 fixed to the yoke base 9, and the connection members 31 are further connected to the connection portions 30a of the relay board 30 and the connection portions 12a of the circuit board 12. Since the relay board 30 and the connection member 31 are not used, the number of components can be reduced, and the connection member 31 does not have to be soldered to the connection portion 30a of the relay board 30 as compared with the case where the connection member 30 is soldered. Workability is improved, cost can be reduced and quality can be improved, and an optical pickup device with low cost and stable quality can be obtained.

(Embodiment 2) FIGS. 3 and 4 show the configuration of an optical pickup device according to a second embodiment of the present invention. FIG. 3 is a perspective view showing an unconnected state, and FIG. It is a perspective view showing a state.

In the first embodiment, the support member 6 is directly connected to the circuit board 12, but in this embodiment, the support member 6 is fixed to the fixing portion 9a provided on the yoke base 9 and extends therethrough. A connector portion 17 having an elastic hook portion 17a is formed on the extending portion 6b of the support member 6 provided. Then, by engaging the elastic hook portion 17a with the engaging hole 12b provided in the circuit board 12 and fixing the same, the end portion 6a of the extension portion 6b of the support member 6 that penetrates the connector portion 17 and protrudes, Board hole 12 provided in circuit board 12
a and is fixed and connected.

With such a configuration, the connection work between the support member 6 and the circuit board 12 is extremely easy and is surely connected, so that an optical pickup device with improved workability and stable quality can be obtained.

(Embodiment 3) FIGS. 5 and 6 show the configuration of an optical pickup device according to a third embodiment of the present invention. FIG. 5 is a perspective view showing an unconnected state, and FIG. It is a perspective view showing a state.

In this embodiment, the connector 1
Reference numerals 8 and 19 denote a first connector portion 18 provided with an elastic hook portion 18a and an engagement projection portion 18b, and a second connector portion 1 provided with an elastic hook portion 19a and an engagement hole portion 19b.
9 is divided.

In such a configuration, after the first connector portion 18 and the second connector portion 19 are engaged and fixed, the elastic hook portion 18a and the elastic hook portion 19a are provided on the circuit board 12. By engaging and fixing the mating holes 12b, the end portions 6a of the support members 6 protruding through the respective connector portions 18 and 19 are guided and inserted into the board holes 12a provided in the circuit board 12. Fixed. As described above, by providing the connector portions 18 and 19 separately,
The connection space occupied on the circuit board 12 can be reduced, and the size of the optical pickup can be reduced.

(Embodiment 4) FIGS. 7 and 8 show the configuration of an optical pickup device according to a fourth embodiment of the present invention. FIG. 7 is a perspective view showing an unconnected state, and FIG. It is a perspective view showing a state.

In this embodiment, the supporting member 6 is covered with an insulating member 20 that is electrically insulated. This can prevent a short circuit between the support members 6 that occurs when the support members 6 and the circuit board 12 are connected, so that the reliability of the optical pickup device can be improved and the size between the support members 6 can be reduced. Therefore, miniaturization is also possible.

It is needless to say that an equivalent effect can be obtained by applying an electrical insulating material to the surface of the supporting member 6 or attaching an insulating material thereto instead of covering the insulating member 20.

(Embodiment 5) FIGS. 9A and 9B are plan views showing the configurations of a yoke base, a support member, and a connector used in an optical pickup device according to a fifth embodiment of the present invention. It is a side view.

As shown in FIGS. 9 (a) and 9 (b), the yoke base 9, the support member 6 and the connector portion are manufactured by being compositely molded. That is, a molding die (not shown)
A plurality of yoke base forming portions and connector portion forming portions are alternately formed at predetermined intervals in the inside, and these yoke base forming portions and connector portion forming portions (specifically, the yoke base 9 The long supporting member 6 is arranged in the molding die so as to penetrate all the fixing portions 9a and 9b (portion for molding the connector portion), and the molding material is injected into the mold to thereby support the supporting member. The yoke base 9 and the connector portions 18 and 19 connected by 6 are simultaneously insert-molded. As a result, a part in which a plurality of the yoke bases 9 and the connector portions 18 and 19 are alternately formed on the continuous supporting member 6 is obtained. Thereafter, predetermined positions A, A ', B, B', C, and C 'of the continuous support member 6 are cut and separated, so that the yoke base 9, the support member 6, and the connector portions 18, 19 are integrated. The obtained composite part can be obtained.

Thus, the yoke base 9 and the support member 6
A plurality of composite parts in which the connector and the connector portions 18 and 19 are integrated can be formed at one time, and the number of assembling steps can be reduced.

[0038]

As described above, according to the present invention, the support member for supporting the bobbin for holding the objective lens is extended through the fixing portion of the yoke base for holding the magnet, and the support member is extended. By directly connecting the end to the circuit board for mounting the hologram laser element, the number of parts and the number of assembling steps can be reduced, and a low-cost and stable optical pickup device can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical pickup device according to a first embodiment of the present invention.

FIG. 2 is a side view of the optical pickup device.

FIG. 3 is a perspective view showing an unconnected state of an optical pickup device according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a connection state of the optical pickup device.

FIG. 5 is a perspective view showing an unconnected state of an optical pickup device according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing a connection state of the optical pickup device.

FIG. 7 is a perspective view showing an unconnected state of an optical pickup device according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a connection state of the optical pickup device.

FIGS. 9A and 9B are a plan view and a side view showing a configuration of a yoke base, a support member, and a connector used in an optical pickup device according to a fifth embodiment of the present invention.

FIG. 10 is a perspective view of a conventional optical pickup device.

FIG. 11 is a side view of the conventional optical pickup device.

DESCRIPTION OF SYMBOLS 1 Objective lens 2 Bobbin 3 Focus coil 4 Tracking coil 6 Support member 6a End 6b Extension 8 Magnet 9 Yoke base 9a, 9b Fixing part 10 Base 11 Hologram element 12 Circuit board 12a Substrate hole 12b Holes 17, 18, 19 Connector 17a, 18a, 19a Elastic hook 20 Insulation member

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kiyoshi Ishioka 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Terms (reference) 5D118 AA03 AA06 BA01 DC03 EA02 EE05 FA29 FB12 FC10 5D119 AA04 AA38 BA01 CA09 HA68 JA14 JA23 JA43 KA43

Claims (6)

[Claims] 1. A hologram laser element, a circuit board on which the hologram laser element is mounted, an objective lens, a bobbin holding the objective lens and wound with a focus coil and a tracking coil, and electrically connected to the focus coil and the tracking coil. An electrically conductive and elastic supporting member movably supporting the bobbin, and a fixing portion holding a magnet constituting a magnetic circuit for driving the bobbin and fixing and supporting the supporting member. A yoke base provided, an optical axis passing through the center of the objective lens, and holding the yoke tiltably with respect to an optical axis passing through the center around the center of the objective lens; A base for holding the support member above, and extending the support member through a fixing portion of the yoke base, Optical pickup device characterized by being connected directly extending edges of the support member to the circuit board. 2. A hologram laser element, a circuit board on which the hologram laser element is mounted, an objective lens, a bobbin holding the objective lens and wound with a focus coil and a tracking coil, and electrically connected to the focus coil and the tracking coil. An electrically conductive and elastic supporting member movably supporting the bobbin, and a fixing portion holding a magnet constituting a magnetic circuit for driving the bobbin and fixing and supporting the supporting member. A yoke base provided, an optical axis passing through the center of the objective lens, and holding the yoke tiltably with respect to an optical axis passing through the center around the center of the objective lens; A base for holding the support member above, and the support member extends through a fixing portion of the yoke base, A connector having an elastic hook portion is provided at an extended end of the support member, and the elastic hook portion of the connector portion is engaged with the circuit board so that the end of the support member can be connected to the circuit board. An optical pickup device characterized by the above-mentioned. 3. The optical pickup device according to claim 2, wherein a plurality of support members are provided, and a plurality of connector portions are provided in at least two parts corresponding to the support members. 4. The optical pickup device according to claim 1, wherein an insulating member for electrically insulating the surface is provided on the supporting member. 5. The optical pickup device according to claim 1, wherein an insulating film for electrically insulating is provided on a surface of the support member. 6. A method for manufacturing a yoke base for holding a magnet, a support member for supporting a bobbin for holding an objective lens, and a connector unit for connecting the support member, each of which is used in an optical pickup device. In the molding die, a plurality of yoke base molding portions and connector portion molding portions are alternately formed at predetermined intervals, and the molding portions of the yoke base and the connector portion are all penetrated. A long support member is placed in the molding die, a molding material is injected into the mold, and the yoke base and the connector portion connected by the support member are alternately and continuously formed, and then, continuously. A method for manufacturing a component for an optical pickup device, characterized in that a predetermined position of the supporting member is cut and separated to obtain a composite component in which the yoke base, the supporting member, and the connector are integrated.